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761 points

·
13th Sep 2011

given that the surface area of the moon is 37.9 million square kilometers, to cover the half of it which continuously faces Earth with a 0.1 millimeter coating would require 1,895,000,000,000 liters of paint. (thats 1.8 tera-liters)

Based on global production of "coatings" in 2009 of 27.2 billion liters it would take approximately 70 years to produce enough paint.

Edit: One slight difficulty is that it would take approximately 40 million Saturn V rockets to carry the paint into Lunar orbit. (Assumes paint is approximately the same density as water). At current prices each Saturn V launch would cost $1.1 billion so the total cost would be $40,000 trillion for transport, $6 trillion for the paint plus we'd need to develop some kind of orbital spray painting technology.

Oh, and assuming we wanted to do this in 70 years, we'd have to launch approximately 1600 Saturn V's every day ...

Edit 2: Thanks to phort99 and lysa_m for using Wolfram Alpha to find out that I've miscalculated somewhere (gah!) so my original estimates need to be increased by a factor of 10. Would have been most inconvenient to find this out *after I'd secured funding*. Luckily, as charlsekelkv points out, the actual coating wouldn't need to be 1mm thick so I've adjusted the thickness of the coating to 0.1mm so the figures remain the same.

Edit 3: Have worked out that this would require 91% of the Earths remaining oil reserves just to fuel the Saturn V's ! Unfortunately, as Teotwawki69 points out, paint is about 1.8 times denser than water so I think we would run out of fuel on Earth before the project was complete.

347 points

·
19th Jul 2011

Reddit had maybe 10,000 accounts five years ago - or less than the current readership of /r/TheoryOfReddit. We've got like 800,000 now. I don't know how many pageviews a month Reddit had back then, but it sure wasn't a billion. Hell, I don't know if MySpace had a billion pageviews a month in 2006. Digg sure didn't. I wonder if Wikipedia did.

If Reddit comments aren't 1/80th what they used to be, we're actually coming out ahead. I agree with you that there's a fair amount more chaff to go with the wheat, but that's more of a sorting problem than anything else. Yeah, we didn't have f7u12 cartoons but we also didn't have /r/askscience or /r/randomactsofpizza.

Growth isn't necessarily bad - but you *do* have to account for it. I think the lightning growth Reddit has experienced over the past year has ended up making "size" more visible than "sorting" but it appears that the admins are actively working to make the Beast That Is Reddit more manageable and navigable.

Reddit is bigger than 4chan, Digg and SomethingAwful combined. Anything with that much versatility and reach is going to be a little unwieldy, particularly when the architecture wasn't really designed for something a tenth this big. The amazing thing is we've still got a place on here to bitch about it... and that the worst blowback we've had is the 2XC/MR skirmishes.

Be patient and take hold of your front page. The old Reddit you love is still there; it's just easily overshadowed by the new Reddit you hate.

345 points

·
9th Sep 2011

According to Wolfram alpha, there are roughly 99 quinvigintillion, 999 quattuorvigintillion, 999 trevigintillion, 999 duovigintillion, 919 unvigintillion, 341 vigintillion, 824 novemdecillion, 829 octodecillion, 56 septendecillion, 121 sexdecillion, 428 quindecillion, 339 quattuordecillion, 363 tredecillion, 143 duodecillion, 596 undecillion, 233 decillion, 24 nonillion, 710 octillion, 494 septillion, 559 sextillion, 116 quintillion, 722 quadrillion, 176 trillion more atoms in the universe than there are permutations of a 52-card deck of cards.

Edit: beer

273 points

·
8th May 2019

https://www.omnicalculator.com/finance/compound_interest

$100 at a standard 2% savings account yield compounded over 18 years is ... wait for it......

​

$142.82

265 points

·
14th Nov 2021

I think most responders are missing the point of the question.

To quote:

> if the Earth were flat and it was a dark night, a candle's flame could be seen from 30 miles away

OP is asking how high the flame would have to be to see the candle on the surface of the Earth, given that it's ** not flat**.

OP's correct answer is:

At 30 mi, assuming you are both at sea level, and you stand 2m tall, the candle will need to be at least 481 feet high for you to see it.

I'm basing this on the calculator at:

253 points

·
2nd May 2019

>What would happen to your body?

Assuming you could metabolize it... You'd gain 2.86*10^(20) lbs of fat (2.041*10^(19) stones). This would be the weight of around 1/500^(th) the Moon, or about 1/5^(th) the weight of Saturn's moon Tethys.

But... that's a lot of energy in a small space.

So... you'd probably have a tiny hole poked through you. Or you'd die in a massive gamma-ray incident that would wipe out the planet.

I couldn't get weight on a single Reese's, but Skittles and M&Ms are around 1g, so we'll go with that. We're talking 4.184*10^(27) Joules per gram. **That's around the energy put out by the sun over 8-12 seconds**, or around *4 trillion* megaton nuclear devices. All in a tiny forbidden morsel.

The thing you're consuming has to be moving quite fast. Like.. really *really* fast. It's more energy dense than a neutron star. It's more energy dense than *antimatter* (which clocks in at 1.8*10^(14) Joules per gram, leaving... 4.183999999999**82***10^(27) joules; not much of a dent).

So, I figured we could speed things up with newtonian physics. But even going 0.9999999999999c, a gram of mass is going to hit with around 9*10^(13) Joules (then, if it were antimatter, explode with that 1.8*10^(14)). Still a tiny dent.

Ah! But as we approach the speed of light, we gain mass due to relativism, increasing our kinetic energy!

At this point, I broke Wolfram Alpha. It wouldn't calculate with enough digits of c.

So I found this calculator... and sure enough, your Reese's would need to be traveling at around 0.999999999999999999999999999999c to have that much kinetic energy stored up.

**Conclusion**: Do not eat that Reese's Piece, for the sake of all life on Earth.

180 points

·
22nd Nov 2021

NTA Send her a couple bucks, tell her you're square and realize you don't need someone this petty in your life.

I ran the calculator on THIS PAGE with the fairly heavy factors of 30 minute shower, $5 per 1000cu ft, $0.13 kw/h for electrical, and a medium flow rate of 2.1 gpm. Comes out to an estimated cost of $1.21 per shower.

Even if we go with the most expensive showers I've used, truck stops, we're talking a maximum of $20 for a half hour booking.

Using the same water cost and assuming 1.5 gallons per flush, one flush of the toilet costs $0.0075. Flush the toilet 133 times for a buck....

For comparison, my family's monthly water bill, for 2 adults averaging a shower a day each, 2 kids averaging a shower every other day, 4-6 loads of laundry a week, cooking etc, maxes out around $60-75 a month.

170 points

·
10th Jun 2019

Assuming the sister has no problems instantaneously accelerating to that velocity, the velocity required would need to slow her aging by a factor of 2 (causing her to age 32 years while the older brother ages 64 years). According to this calculator, that would be 0.866025 c or 161325.3 miles per second.

165 points

·
1st May 2011

Just to be accurate, the issue here is not in the order of same level expressions (the TI-85 also does left to right). The issue is that, for the parser of the TI-85, implicit multiplication (where you don't write the multiplication symbol) has priority over regular multiplication and division.

Before you discard it as the wrong way to do it, consider it actually makes sense for variables:

6/2x

Is this 6/(2*x) or (6/2)*x ? Most would agree that it is the former, including WolframAlpha, even though according to pure PEMDAS, it should be the latter.

Now replace x with (1+2) and you have the OP's equation.

134 points

·
11th Mar 2011

From WolframAlpha:

current distance from Earth: 394820 km

average distance from Earth: 385000 km

March 19: 357229 km

132 points

·
12th Sep 2011

to find out the nutritional information for a cubic light year of fried chicken of course, isnt that what everyone uses it for?

113 points

·
24th Nov 2021

I think the biggest problem I have is that when I get together with Java and Python programmers at a party, I always have to justify why I brought two tall, blonde models with me when none of them can ever get a date. Then one of them always asks me to move my Ferrari because it's blocking their Toyota Corolla. Sometimes they bully me for being so successful so I have to wipe my tears away with $100 bills. I don't think people understand how hard it is to have a language that's so in demand that you can always find good paying work. So I guess I don't like how sometimes I feel like an outcast because I have so little to complain about.

Oh... and units of measure . C# has a time unit of measure, but you always have to roll your own mass, temperature, length and currency units of measure. A language like Frink already makes it pretty easy to do this. I don't understand why a business oriented language like C# doesn't have units of measure already baked in.

103 points

·
17th Jul 2021

This is how I lost 15kgs in3,5 months without micro-managing, or calorie counting or doing anything specific. Just lived, ate, enjoyed life and got connected back with people from all periods of my time again. I hope it helps.

- Removed and stopped buying munchies, snacks and any calorie containing drinks.

- Implemented 2x 30 mins walks and maybe another 1 hour after work.

Llistened to the podcasts, books, video's or called family/friends during these walks. It was not lost time at all.

- Stopped taking warm showers, and wearing a jacket outside. No matter what weather. Some days I could endure 30 mins of -2C, some days couldn't endure an hour of 15C. It didn't matter. Now I enjoy the cold. Everything is too hot.

- Did some fasting in between like not eating a full day and stuff on the days I didn't feel like eating.

- Took breaks from screens after moments of conflict, hate, anger, sadness, happiness during work hours to process.

- Every time I felt hungry, I took a cup of water first and waited 15 mins to see if I was thirsty or really hungry. I ate if I still felt hungry.

Regimen above and adherence to it gave me a caloric deficit of 7000-9000 kcals per week, depending on the fasting days. Gave me a lot of pleasure and I felt better.

- Slept as much as I can and the more I could sleep, the less tired I got and everything got better. It was the real medicine for me. All above were just the means to an end.

P.S.: Just find a caloric [TDEE calculator](https://www.omnicalculator.com/health/tdee) and use Miffin-St. Jeor to calculate your average, if you wanna build a deficit target.

93 points

·
9th Sep 2011

>The U.S. has just shy of 9,000 **M**W solar installed. Germany has a bit under 18,000 **M**W. How does 18GW vs. 9GW = 6,000%?

[emphasis mine]

Where are you pulling these numbers from?

According to 2008 numbers:

- Germany = 3.8
**b***illion*kWh per year - US = 843
**m***illion*kWh per year.

http://www.wolframalpha.com/input/?i=solar+energy+per+country

3,800,000,000 / 843,000,000 = 4.5 (approx.)

That means that Germany has 4 and a half *times* as much energy from solar than the US. That is around 450%.

The 6000% comes from simple arithmetic that US has 3900% more Sun *available* than Germany around the year which means that Germany produces 450% more utilizing 3900% less i.e. if Germany had US amount of Sun available they would be utilizing 39 times more Sun to produce 3.8 billion x 39 = 148.24 billion kWh per year / 843,000,000 = 175 (approx.) or 17,500% more than the US *did* in 2008.

So if the US has managed to increase it's kWh per year since 2008 then it would have to have increased it 3 fold to bring it up to at least 2.47 billion kWh *in order* to be utilizing solar power *only* 6000% *less* efficiently than Germany does.

And Germany doesn't have Southern California, Arizona, Nevada, Texas, New Mexico, Louisiana or Florida. They have 4 month long winters there.

What this means is the equivalent of one northern US state (Washington, Colorado) producing 4.5 *times* as much solar energy as the rest of the US *combined* in 2008. Do the math on that.

84 points

·
25th Mar 2011

I don't think this is right:

>First calculate how many balloons you pop, falling 1m:

>V = 1,8m * 0,5m * 1m = 0,9m³

> >Vb = 0,05³m = 125*10^-6 m³

> >N = V / Vb = 7200 balloons

>The force would be:

>F = 0,15N * 7200 = 1080N

>With your weight of 80Kg you calculate the deceleration:

>a = F / m = 1080N / 80Kg = 13,5m/s²

The 1080 N is not a constant force on your body, but the total force exerted during 1 m of fall, so you wouldn't be decellerated at 13,5 m/s^2.

Think about it. During a fall of 10 meters you exert a total force 10 times higher, but your acceleration won't be 10 times higher.

I'm not sure what the correct way would be though, I suppose something with Kinematic energy and power.

**EDIT:** So I tought about it a bit, I think this is the way to solve it:

Impuls = Change in momentum

Momentum = mass * velocity

Impuls needed = Change in momentum needed = Current momentum - 0 = 80kg * 50m/s = 4000

Impuls = Force * duration

Impuls = 0.15 N * 1e-4 s (I could be way off on this duration) = 0.15e-4 Ns

Total balloons that need to be popped = 4000 / 0.15e-4 = 266 666 667 balloons

With 7200 balloons per meter this is about 37000 m or 37 km

**EDIT2**: Forgot about the gravity, so what I wrote is wrong as well.

**EDIT3**: Impuls in time interval dt = v(t) * 7200 * 0.15e-4 * dt - 9.81*80*dt +0.5*1.2*1.2*1.8*0.5*v(t)^2*dt

The last term is for the drag resistance. Calculus class has been a while so i put this into Wolfram alpha

Your velocity will never reach 0/ms. Which makes sense I guess, because if you would just lie on balloons in your needle suit the balloons would pop just because of your weight on the balloons.

83 points

·
22nd Aug 2011

4L of whole milk has 139 grams of protein. A 4L of milk where I live is about $4. So you get 1390 grams of protein for $40.

The protein that I currently have was $40 for 4 lbs. Each scoop is 39 grams so that works out to about 46 servings. At 26 grams of protein each that is 1200 grams of protein for your $40.

When I started writing this I thought it was to prove you wrong. It turns out you were right. Kudos.

82 points

·
20th Mar 2011

I've not heard of that stereotype before. It is recognized that many Americans are hard workers

"Americans take vacations so they can work more. Europeans work so the can have vacations." is a phrase I've read.

Are you confusing it with the Fat American stereotype? That is because you are fat.

http://www.wolframalpha.com/input/?i=obesity+rates+US+and+Europe

81 points

·
19th Jun 2011

Finite amount of throwaway accounts? Seriously?

Let's do some math...A reddit username can be up to 20 characters long (p) and can consist of any mix of 36 different characters A-Z and 0-9 (n). By summing n^p from p=1 to 20, we discover that the number of accounts available is **1.37 x 10^31 **, or **1.98 x 10^21 accounts per person** in the world. So yes, finite. I guess.

But yeah, anonymous accounts would be stupid.

78 points

·
17th Jul 2018

TL;DR: my estimation is 402 feet based on a calculator I found online, but I'm far from certain.

I'm no math genius, so hopefully someone can respond to this and either validate this or explain further, but I used this calculator to plug in the numbers I could find. Acceleration is constant at 9.8 m/s^2 . The velocity seems to be 0 at the time of the fall, though she could've thrown it down slightly making velocity somewhat higher (this would increase the height in the calculation AFAIK). Time of the fall was a bit tricky, it seems to be from 5 seconds to 10 seconds, but some of this time could've been the phone bouncing around after it hit the ground once (it's hard to tell exactly when it hits because the screen is constantly whirring). I put 5 seconds in for time of the fall and ended up with a height of 122.6 meters, or 402 feet. But as I said, this is not my area of expertise. I just used a calculator that (I think) should get the job done.

EDIT: formatting and typos

74 points

·
17th Nov 2020

ill find out if it will.

I am using a projectile motion calculator https://www.omnicalculator.com/physics/trajectory-projectile-motion

Looks like 25 degree angle the bridge that is up.

From The top of the vertical bridge to the road looks about 20feet.

At 50 mph it can travel 162 feet before it drops 20 feet in height to the road.

B. , is there a second draw thing that is up but not in the photo. If so, it can not drop any feet at all, if the draws are at the same height. That would mean it could travel around 125 feet.

**So as long as the gap is either less than 162 in case A or 125 feet in case B. The car will make it.**

67 points

·
9th Jun 2011

1/speed of sound ~ 4.689 seconds/mile. So for every 4.7 seconds, sound travels 1 mile. Granted the actual rate is dependent on air pressure, humidity, temperature, I'd say roughly for every 9 seconds, sound travels 2 miles. So when you see the lightning, that's so fast we'll say it's instantaneously at you, and if you hear the thunder 9 seconds later, then the sound has traveled 2 miles to get to you.

67 points

·
11th May 2011

Actually, there are in fact 1000 MB in a Gigabyte. What most people think of as a Gigabyte is actually called a Gibibyte, and it's not 1024 Megabytes, it's 1024 Mebibytes. Windows lies and says that it measures data in Gigabytes (GB) and Megabytes (MB) but it is actually measuring in Gibibytes (GiB) and Mebibytes (MiB). So windows basically displays the wrong units. That's why when you buy a hard drive that says its 1TB for example, it is actually 1 TB, or 1000 GB, but its only 931 GiB, which is what windows shows as 931 GB.

Don't believe me? http://www.wolframalpha.com/input/?i=1TB+to+Gibibytes

/Melvin

60 points

·
30th Aug 2011

China's GDP is only 36% of that of the US though--people individually earn significantly less money. So on a per-GDP basis, China is spending 0.64% of their GDP on 'clean technologies' whereas the US is spending 0.12%.

Sources:

56 points

·
26th May 2011

Indeed, speaking in terms of expected value, we can expect about 4.8 million people to die, and thus fully warrants attention and investigation.

56 points

·
5th Feb 2011

I approve of the message, but this stats seem dubious.

The easiest one to disprove is that three billion people are illiterate. We have roughly seven billion people on the earth, so 3 billion is about 42% of the population. That means that the article is saying the world's literacy rate is about 58%. However it is much higher than that.

http://www.wolframalpha.com/input/?i=What+is+the+world's+literacy+rate%3F

http://en.wikipedia.org/wiki/List_of_countries_by_literacy_rate

55 points

·
15th May 2011

54 points

·
22nd May 2011

1 million yen, actually. At the time of its Japanese release, this was equivalent to $9581.30 Extortionate, yes but far more affordable than the price put forward

54 points

·
1st Jul 2021

I second this. Based on height and current weight, he is considered “overweight” but isn’t that far off from normal. At this point his body may not want him to lose weight very easily. 1500-1800 cals may be too low and is causing him to burn less calories over time. Metabolism does slow as we age but 23 is kinda young for a man to have a lower than average metabolism due to age.

I think he would benefit from at least 150 minutes of steady state cardio a week and weight training (full body, not just the arms) More muscle would mean a higher resting metabolic rate. He may also want to up the calories a bit and try consuming more of those calories from protein as they have higher thermic effect of food (your body will increase the metabolic output when processing more calories from protein). I suggest having a caloric deficit of no more than 500. Slow, steady, and consistency wins the race here.

Here’s a link for determining calories needed based on daily activity, age, current weight, etc. No calculator is perfect and he will probably need to make adjustments but it could be a useful starting point: https://www.omnicalculator.com/health/bmr-harris-benedict-equation

If nothing is working after cutting a lot of calories and upping the cardio, perhaps he should see a doctor to rule out any unusual metabolic issues preventing him from losing weight.

Congrats on losing 8 lbs and him losing 2! Best of luck to you and your boyfriend 👍

54 points

·
21st Mar 2011

(1+0.9Cos(8t))(1+0.1Cos(24t))(0.9+0.05Cos(200t))(1+Sin(t)), when plotted as a polar function over 0 <= t <= 2pi, looks like a marijuana leaf

53 points

·
28th Apr 2011

Nice, I like the way Wolfram represents the equation! I also like how it can tell me the amount of carbohydrates in a cubic light year of bananas, too.

49 points

·
9th Jun 2011

There are 2.27 popes per square kilometer in the Vatican.

Also, the last time I was pulled over for driving at 108 km/h in a 80 km/h zone, I was asked, "Do you know how fast you were going?" to which I replied, "10^-7 c" (where c is the speed of light)

49 points

·
8th Jun 2011

Either the twelve oranges problem or the red cap black cap problem.

You have twelve oranges, one of which is either heavier or lighter than the rest, which are all of equal weight. You have three chances to use a scale, which can balance some set of oranges to another set of oranges and tell you which side is heavier. How do you determine which orange is the special one and whether it's heavier or lighter?

There are at least two (apparently) distinct solutions I know of.

20 prisoners are told that they will be lined up the next day in a line such that each prisoner can see all those in front of him but none of those behind him. Each prisoner will be given either a red cap or a black cap. They will be able to see the cap of those in front, but not their own nor those of the prisoners behind them. The prisoners are to be asked one by one from the back of the line what color they think their cap is. Prisoners who answer incorrectly are shot and prisoners who answer correctly are set free. Prisoners can hear all the other prisoners' answers and whether they got shot or set free.

There is a strategy that, assuming proper execution, saves both the maximum expected and maximum guaranteed number of prisoners. What is it?

Clarifying point: prisoners are allowed to fully conspire the night before, but on the day they are lined up, they are no allowed to communicate to one another beyond the extent to which they can see people in front of them and hear calls and outcomes behind them.

**HINT:** The expected number of prisoners saved is found HERE. The maximum number is found HERE.

47 points

·
7th Feb 2011

Nice! My only comment would be, why do the moons look unnaturally large? Ganymede is the largest and it's only a fraction of Jupiter's size. That photo makes them look deceptively big when they should be just pin points compared next to the giant.

Edit: In response to a question I was sent, WolframAlpha has a nice comparison and illustration to give you a better idea of the sizes involved

46 points

·
19th Nov 2021

Not enough information to calculate. Where in the asteroid or comets orbit this impact occurs at and the direction and orbit of both the asteroid and the earth make a huge difference. Is the asteroid going to hit the earth dead center? glancing blow? that makes a big difference too. here is a simple momentum calculator you can use to play around with this. Set the impactor to 7500 m/s and the asteroid to 0 m/s (relative velocity) and your 100 ton impactor can slow down a 750,000 ton asteroid by 1 m/s. for comparison, a 1km dia asteroid weighs around 1.4 billion tons.

46 points

·
30th Sep 2021

Greatest G force handled is 46.2 Gs at a test site, you can definitely survive crazy forces = somewhere around 7700lbs on the human body. Crashing though, at 65mp and 150lbs human would be equivalent to 1076.2 Gs = 161,381lbs on the body.

With a seat belt, that all massively changes to less than 1/5th of what I stated...

46 points

·
29th Jul 2020

That's a wet bulb temperature of 35C, not an ambient temperature. Wet bulb accounts for both temperature and humidity, and it effectively measures the coolest you can reach using only evaporative cooling (so the coolest temperature you could maintain through sweating alone). With an abundant supply of ice water, you might be able to manage a bit warmer, since you'd also be cooling off through the pre-cooled water. At 47C ambient, your wet bulb temp was still below 35C unless you also had above 40% humidity, and nowhere currently on earth experiences that combination of humidity and temperature. You can play around a bit with the calculator here if you want to better understand the relationship.

Above a 35C wet bulb temperature, it's physically impossible to cool something below 35C through evaporation, regardless of how much water you have. This means that regardless of quantity of sweat produced, your body could not keep your skin cooler than 35c, resulting in overheating and likely death.

45 points

·
10th Aug 2011

~~Do you have any idea how many combinations you have~~ Think about it this way: how many combinations do you need to try to get dictionary to the power of 4? According to this sketch, that's (2^11)^4. With a dictionary attack of 1000 per second you need >500 years to try all combinations. The order in which you do your attack does not make ANY difference here. I would argue that even dictionary^3 is still safe enough for a typical consumer.

45 points

·
3rd Mar 2011

with the captcha above there is a 1 / 5 chance of guessing correct or 20%. If a bot is trying to set up 1000 fake accounts ~200 will be successful. With your normal captcha you're dealing with a large group of words to choose from so about 1 / 600,000, probably less, but the probability approaches 0%. I'm sure someone will correct my math, but I'm hoping you get the picture.

this is dealing with a captcha attack that only uses guesses, there are other ways to break a captcha

45 points

·
5th Apr 2019

According to this link, 53 average sized balloons would lift an empty Glock 19, and 31 could lift an empty Ruger lcr. This is a far lower quantity of balloons than I had expected.

44 points

·
31st Aug 2011

I've taken the liberty and estimated the energy of this impact. I only did this using a bit of Google and WolframAlpha, so excuse any mistakes:

The meteor seems to be about 32 blocks in diameter (counted), so *d*=32m and its volume *V* would be ca. 17157m³. Using these numbers for density *ρ*=7.8g/cm³, it would have a mass of ρ*V=*m*=1.34E8kg.

Using the same source for the speed *v*=20km/s, the meteorite's kinetic energy would be m*v²/2 = 1.34E8kg * 0.5(20km/s)² = 2.68E16J. This is equivalent to about 427 Hiroshima bombs.

44 points

·
13th Jul 2011

Oliver didn't really take until 2000 I'll just blame John Oliver because I can.

42 points

·
22nd May 2021

It's worth checking your waist/height ratio as that's a better indicator of risk for obesity related disease

https://www.omnicalculator.com/health/waist-height-ratio

Anything under 0.5 is good - I'm UK 10/12, but my ratio is 0.47, so literally just barely squeaked under the danger level

I tend to focus on my waist measurement more than anything as I'm in my 40's & diabetes is rife in my family, so I have to keep an eye on visceral fat

The healthy zone for women is a waist under 32 inches & I'm currently 32.25, so again - uncomfortably near the danger level

Dress sizes are meaningless these days due to vanity sizing - found a gorgeous Italian dress in storage I bought about 10yrs ago which is L/XL and it fits perfectly on my UK 10/12 body. But it's L/XL. The Italians are harsh 🤣 Explains why the Mediterranean diet is up there with Japan in the healthy league table tho if UK 10/12 is a big girl size.

41 points

·
30th Apr 2011

If you had a monitor with a resolution such that there were 34 pixels in total (17x2 would be an example of such a resolution), you'd have roughly the same number of different possible combinations as there are atoms in the visible universe (10^80)

41 points

·
15th Mar 2011

If the moon were made of blue cheese, it would be enough food to feed the world's population for about 50 billion years.

calories in moon's mass of blue cheese / population of earth / rda calories / 365

40 points

·
12th Sep 2011

It can do a huge amount of stuff that many people don't know about. For example, want to find out how drunk you are? Wolfram Alpha can tell you.

40 points

·
16th Jul 2021

Did the calculation on omni calculator just to double check. The size of 1200 pb comes **only** from the data that Google, Amazon, Microsoft and Facebook collectively stored 2 years ago. How is the entire internet only 47.85 pb in size (according to your calculations)?

39 points

·
25th May 2011

> I can only imagine how much larger that number would be if we were to spend $30,000 annually per student.

No problem with have math.

$17.9 billion / $7000 per student = 2.6 million students

This jives with the number of people under 18 in Michigan according to Wolfram Alpha. So at $30,000 per student you would spend $77 billion total on education which is $59 billion more than they are spending right now or an increase by 330%. The total state and local budget for Michigan is $80.4 billion (KalamMekhar's link) increasing education spending to this level would require a 73% increase in revenue, or elimination of every other function of government in including pensions, health care, law enforcement, and public transportation.

39 points

·
21st Jul 2017

According to this it would get you a little less than 150 miles but that's not including the cost of leveling land which in my opinion would be the majority of the cost. I doubt 1.6 billion would be enough for even 50 miles in real life, and that's assuming we aren't talking about the part of the border that's on a mountain range.

Not too mention a wall does fuck all.

38 points

·
6th Mar 2011

The answer is approximately 4.29733.

Use this image:

We've got two similar right triangles.

ABC is similar to EFC

BCD is similar to BFE

So using this and the Pythagorean formula we can come up with enough equations to eliminate our variables:

10^2 = x^2 + y^2

12^2 = x^2 + z^2

u^2 = w^2 + 5^2

v^2 = (x-w)^2 + 5^2

u/10 = w/x = 5/y

v/12 = (x-w)/x = 5/z

And it's a straightforward, but long, solution from there. So I just plugged it into Wolfram Alpha:

37 points

·
29th Jan 2011

Distance from earth to moon < Roche limit of jupiter

Even if it corrected for angular momentum, earth would be broken apart under Jupiter's gravity. It'd probably form some pretty rings, too.

36 points

·
26th Mar 2011

Consider the ocean. When you're near it, you notice the waves and the movement of the water, etc. When you view the ocean from far away, it looks relatively still.

That's the difference between Quantum and Classical. Particles never stop behaving with quantum rules, you just don't notice it from up here.

If you're better with math, look at the functions y = sin(x) and y = x here. Now, look what happens when you look at it from far away.

Classical Mechanics is like using y = x as an approximation for y = sin(x) + x because sin(x) is always going to be between -1 and 1 which isn't significant when you're dealing with large numbers, but makes a significant difference when dealing with smaller numbers.

36 points

·
18th Mar 2011

For some reason, I imagine a lost episode of Arrested Development.

On the next episode of Arrested Development:

Gob lost his job as a Magician (again) and somehow ends up in China. Wondering where to find a job as he walks down a busy business district, he is grabbed by a desperate Chinese business man who yells he needs a white man and will pay good money. Confused, Gob says he is flattered but he is only interested in the fairer sex. Suddenly, more businessmen appear and start grabbing Gob and pulling him towards a luxury car.

Next scene: As he is being fitted, groomed, and fussed over by people, Gob is being explained to by the businessman that he is to pretend to be the new CEO of the company to prevent their stock to devalue after the last one has disappeared due to mysterious circumstances.

One of the maids asks him if he would like a drink. A strange light glints in Gob's eye as he looks at his clothes fit for a CEO reflecting off the mirror.

Close up to Gob's face as a murmur escapes from his mouth: "no...I wanna spill booze all over my fucking forty thousand three hundred ninety Yuan suit, COME ON!"

*End Preview*

35 points

·
19th Aug 2011

35 points

·
1st Jun 2011

All politics and opinions on the wars aside, YSK the Lancet figures are extremely controversial and tend to be higher than most other estimates.

As a statistician I am insulted by the way they calculate their averages. For example, they claimed the excess deaths in 2003 in Iraq was 98K. To get this figure they estimated a range of 8,000 to 194,000 and then averaged the two. This is a total abuse of statistics. When you have a huge range like that, you are basically saying "I don't know". If you want to average the numbers, you shouldn't do it in linear space like that, you should do it in log space. Intuitively this is because the relative error between 15K and 10K deaths is the same as the relative error between 150K and 100K.

If they averaged in log space, their figure would have been 31,600

35 points

·
21st Apr 2021

So I'm curious and I used this free fall calculator to do the hard math for me.

Using the stopwatch on my phone I'm getting 2.5-2.8 seconds of free fall. That gives a range of 100-126'. Two seconds = 64 feet. And 1.5 seconds = 36 feet.

I don't know whether your forward momentum matters. Or maybe wind resistance. And I'm just eyeballing it on my phone but it *seems* like 40' might be a super lowball estimate. Like I don't know how tall that spruce tree on the ground is but you're waaaaaaaaaay above that. Even if it's just a 10' tree you're looking higher than 3-4x that.

TL;DR: don't shortchange yourself, you probably jumped off a 100'+ cliff and until a physics nerd corrects me let's go with that.

34 points

·
25th Jul 2011

I got this. Start with the Stefan-Boltzmann law and call j*=dE/dt *1/Area. Use dE = c *m *dT, where c is the specific heat. Plugging in, integrating both sides from Tinitial to Tfinal we get:

t = c* r* rho/(9 *sigma)*(1/Tf^3 -1/Ti^3 ), which for a 1m ball of iron gives 2.3 days. This is of course assuming pure radiation cooling. No conduction.

34 points

·
14th Nov 2021

Doing the math because I'm bored: According to this calculator an hour of 1080P 60FPS video encoded in H.264 (pretty much the standard compression method) is 93.2GB. That's around 640 hours or 26.5 days. Uncompressed 1080p video is 1343GB per hour so it would "only" end up at 44 hours... Which is still a lot, but far from 6.6 years

33 points

·
16th Aug 2011

Much smaller than a basketball.

More marble sized. A black hole of the moon's mass would only have a radius of about .004 inches.

[](/c16 "Believe me, I've studied the moon a fair bit.")

32 points

·
1st May 2011

I didn't check the rest of the numbers, but there are 3.785 liters per gallon, not 4.54. That's going to affect your bigger numbers. An easy way to remember (for an American male) is that most urinals have a note on them saying they're 1 gallon (3.8 liters) per flush.

(Edit) Source: http://www.wolframalpha.com/input/?i=1+us+gallon+in+liters

31 points

·
11th Apr 2011

According to wikipedia the radius of the event horizon is 2Gm/c^2. A large stellar black hole, let's say 10 times the mass of the sun, will therefore have a radius of 2 * 6.67e-11 N m^2/kg^2 * 2e31 kg / 3e8 = 29530m.

At 29530m, the gravitational attraction between a 10kg mass and the singularity is 30615229520301.633N. The gravitational attraction between a 10kg mass 2m lower, at 29528m and the singularity is 30619376941913.746N. The tidal forces are comparable to your head having 330 times the thrust of the space shuttle and your feet being anchored to the ground.

But this is a relatively small black hole; consider a supermassive black hole of about 10^8 solar masses. (I actually have no idea what the math will yield)

At the event horizon, 295300000000m up, the gravitational force is 3061522.9520301633N. Two meters lower, 295299999998m up, the gravitational force is 3061522.952071633N; a mere 40 micronewton difference. You probably wouldn't notice the tidal forces, unless you were in a sufficiently large craft; in which case you're have 'gravity' at the top and bottom, pulling you very, very gently towards the ceiling and floor, respectively.

Of course, this is all for a non-rotating, non-magnetic black hole. The article assumes a rotating black hole or one with a large electric charge.

31 points

·
29th Mar 2019

Per this site, 0.02 mg would be the equivalent of 1797510 megajoules. And according to this site, that is the equivalent of 429.62 lbs of TNT. Not anything near a nuke, but still a fuckton of energy.

31 points

·
3rd Jan 2011

For those of you who think this is easy, Jeopardy's question format isn't always that straightforward- they usually have categories with a theme, and the answer only makes sense in context of that category's themes. Often there's an entire category in which the clues are just one or two words, or a category of nothing but puns.

I'd expect the AI to be very good at clues like "This actress won the Oscar for Best Actress in 2003", but not so much finding "things you jump" as the response to the clue "A battery, a claim, a checkers piece" (in a category called COMMON BONDS).

30 points

·
18th Jul 2011

30 points

·
24th May 2011

Actually 5 feet 9 inches is an average for many countries. The US is abnormally tall.

I'm 6 feet 1 inches and only in the US am I considered average.

Correction: http://www.wolframalpha.com/input/?i=average+height+male

30 points

·
12th Jan 2011

Like this?: http://www.wolframalpha.com/input/?i=us+national+debt/gdp*100

edit: or this rather: http://www.wolframalpha.com/input/?i=us+federal+deficit/gdp*100 ? (edit, nvm, see Reductive's comment below - go with federal debt)

29 points

·
14th Aug 2011

You get a vertical asymptote wherever the denominator equals zero. You can do that arbitrarily.

The real trick is getting two horizonal asymptotes. The quickest way to do that is to use the absolute value function on either the top or the bottom of a rational function, where both are of the same degree.

Sooo...without actually checking (I'll do that shortly), I would guess that y = |x^3 | / (x + 1)(x + 2)(x + 3) would do the trick.

EDIT: And it works!

29 points

·
5th Aug 2011

Your maths-biased competitor has it undefined: http://www.wolframalpha.com/input/?i=0^0

:D Awesome, though, that you just stumble upon the person who actually programmed the thing for Google. Very reddit...

29 points

·
29th May 2011

Well, the estimated surface area of the Earth at ground level is 510,072,000 km^2, so that would be 1.992 times 10^12 chunks (1,992,000,000,000 chunks), which in the Beta format would be 20.01 KiB plus the number of bytes to store 1,992,000,000,000 chunks' worth of blocks, which varies upon the compression level. Assuming no compression at all, and one byte per block (x,y,z,and id; I know it's undersizing significantly), then the maximum size of the world would be 24.48 petabytes, which would be in one file. A non-complete list of filesystems that support files that large is: HFS+, ReiserFS, ZFS, XFS, Veritas File System, Btrfs, SquashFS, Tux3, CXFS, UDF, and NILFS.

Of course, the file would be split into smaller amounts, increasing the total storage volume by 20.01 KB per file, plus filesystem overhead, but you'd still need 24.48 PB + (20.01 KB * *n*) of storage.

29 points

·
4th May 2011

I spend a lot of time in BC Parks and I'm AGAINST getting rid of parking fees. This is a great PR move for Clark, it sounds great, but Parks needs that money. I haven't heard anything about the government stepping up funding for parks to offset the loss of revenue.

Garibaldi Park's staff, for example, has been slashed over the years so that they now have only a small handful of awesome, dedicated Rangers who are tasked with patrolling a park larger than 58 countries.

If the government wants to step up funding AND make parking free, then hey, that's awesome, but personally, I'm perfectly happy paying parking knowing that it goes to helping Parks do the awesome job they do considering how cripplingly underfunded they are.

29 points

·
28th Apr 2011

There should a be contest for finding the most absurd challenge Wolfram can handle

29 points

·
26th Feb 2011

Just some perspective:

It's 5 weight watchers points (on the old system) You're allowed 20 - 25 per day (depending on weight).

Most of the sugars come from fruit (raisins, cranberries, apples). Assuming they don't add sugar to it, that's fine.

300 calories for breakfast? That really not even enough.

Theres a solid amount of fiber. A snicker's bar has 1 g of fiber versus 5g for this oatmeal.

Using wolframalpha I compared Quaker instant oatmeal with some of the added toppings and mcdonald's oatmeal

It's really not that bad....

28 points

·
29th Jul 2011

Since no one *can* know when the rapture will happen, and there are nearly 7 Billion people in the world, if each of them would pick a day that no one has previously picked we could postpone the rapture for 19.18 Million years.

28 points

·
6th Jul 2011

I learned to control this with a sort of meditative exercise where I visualize thinking. I start by imagining a pitch black infinitely large space, with a black object shaped like the graph here in the middle. I visualize each word that I think as a short blue stripe that moves toward the object and goes up along its surface, disappearing out of view. I think exclusively in words so this works for me.

I then concentrate on reducing the amount of stripes that appear until the scene is pitch black again (and I'm no longer thinking of anything.) It took some practice, but now I can *always* fall asleep within five minutes of getting into bed.

28 points

·
9th Apr 2011

The circumference is fixed at 1, so each side of the polygon has length a = 1/N. A regular polygon can be broken up into N isosceles triangles with one angle of alpha = (2pi/N) and two angles of (pi - 2pi/N)/2. The side opposite the angle of alpha = 2*pi/N will have length a. Break each of these isosceles triangles again into two right triangles, such that tan(alpha/2) = (a/2) / b, where b is the height of the right triangle. Then b = (a/2) / tan(alpha/2). The area of each isosceles triangle is then A = (1/2) * a * b = a^2 / 4 / tan( alpha/2 ). Putting a = 1/N into this gives:

A = 1 / (4N^2 ) / tan( pi / N ).

Edit: Left off the total area: The total area is then N * A = 1 / (4N) / tan( pi/N ).

Also, note that as N goes to inf, the above approaches 1/(4pi), the area of a circle with circumference 1.

Plot.

28 points

·
16th Oct 2020

I loaded the video into Avidemux and did the math.

Launch initiated at around 3.90 seconds, launch complete at around 4.07 seconds. 170 ms for the launch. Impact at 6.57, airtime 2.5 seconds, horizontal distance roughly 1.8x the height.

With a launch end height of 2 meters, he reached a height of 8.7 meters, and had to have had an initial speed around 13 meters per second (using a 61.3 degree launch angle derived from horizontal distance = 1.8x max height). Given that he achieved the speed in 0.17 seconds, the average acceleration during that time was 76.5 m/s2 or 7.8 g.

Reasonably good confidence on the altitude and launch speed (probably got that within 15%), the acceleration is going to be inaccurate due to the short time frame being hard to measure (but given that it probably wasn't linear in practice, peak acceleration was likely higher).

The guy experienced an acceleration comparable to a fighter pilot (albeit for a shorter time), with very sudden onset. He also suddenly found himself flying through the air at around 47 km/h, while simultaneously being weightless (free fall).

Sounds fun, and definitely must feel like low orbit. Space shuttle launches are limited to 3 g (but sustained, so not really comparable).

Tools used: youtube-dl to get the video, Avidemux to seek through it frame by frame, https://www.omnicalculator.com/physics/projectile-motion for the flight.

28 points

·
31st Mar 2019

According to this online calculator the Shwarzchild Radius (the radius of the spherical volume a given mass must be compressed into for it to become a black hole) of 1,234,016,267kg is 2 attometers. That's 0.000000000000002 millimeters, or 2 quintillionths of a meter, or one 500th of the radius of a proton.

Yeah; making a black hole is not easy.

28 points

·
16th Jan 2011

i live in canada and am canadian. i have 2 brothers that moved to the usa years ago and are living there now... very happily. they both went to further their careers.

this daily circlejerk of how canada or the usa is superior is getting fuking annoying. both countries have pros and cons but for the most part the countries are extremely similar with the exception that the usa is 10x as big. context.

as for political ideals... seems like everyone on reddit dislikes their pm or pres. the laws suck... healthcare sucks... blah, blah, blah. it's really just a lot of the same. i suspect the top comment on this thread will be about someone's ideology which really has little practical implication regardless on which side of the border one chooses to live.

27 points

·
8th Aug 2011

They've got a decent protein, fiber, and vitamin profile. Plus, carbs are good for you, you shouldn't be afraid of them. You need more than just protein to build muscles - you need excess calories as well. Oats are an easy, cheap way of getting those calories.

27 points

·
26th Nov 2021

Here. It’s a digital coin flipper. Not sure if he used this particular website, but the OP did state that they took the predictions from NFL.com/ESPN etc prior to the season and dumped them on a online coin flipper.

27 points

·
20th Nov 2020

This time dilation calculator says it would be about the same, 40,000 years.

To get the time dilation effect you need to be traveling at the speed of light or close to it. Voyager is going at 17 km per second, so not even close to the speed of light, which is about 300,000 km per second.

26 points

·
1st Sep 2011

26 points

·
5th Jul 2011

Perhaps they switched to a log scale, one possible conversion function which would put warp 13 at 0-10 warp scale 9.7. Honestly, this would make sense once you build warp drives that are pushing more decimal places.

edit: that function goes above 10, this is better, w13 = w9.3

26 points

·
30th Nov 2021

I think a good explanation is to use the length/time contraction formula and and energy consumption.

So when we observe objects(with mass and dimensions) travelling close to the speed of light the length of objects start to get compressed or get shorter or closer and closer to zero, their clocks start to tick slower and the amount of energy needed to get closer and closer to the speed of light gets more and more tending to infinity.

Since we are made of matter we would need an infinite amount of energy when at C.

There are a few online calculators that you can play with that show this like https://www.omnicalculator.com/physics/length-contraction

26 points

·
7th Jun 2011

I live in a country where bicycling is disproportionately much more common than other places, particularly the US. Our traffic laws are adapted for a traffic system with bikes everywhere (it's illegal to ride a bike without lights at night), and bike lanes are plentiful and almost certainly present even on smaller city roads.

And yet, when Americans drive in my city, they *still* tend to be incapable of paying the right amount of attention to bicyclists, even though the bicyclists mostly follow the same traffic rules as everyone else.

I tend to think that it's much less a question of some "death wish" and much more a question of knowing what you have to be aware of. If you're used to never seeing bicyclists, it's not that weird if you suck at driving around them.

On top of that, it's significantly harder to get a driver's licence here — you have to attend actual classes, and it takes longer. The US has around 3 times more fatal road accidents per year per capita than my country (Denmark).

So yeah, do with that what you want. :)

25 points

·
3rd Aug 2011

I'm guessing you live somewhere with moderate electricity prices and 'several thousand dollars' means at least 3000 and that you had two 4870X2s and a C2Q running. So the whole PC had a power drain of no more than 1kW. You stopped in 2009 latest (at least that's how I interpreted it), so you must have used a different setup before, as the 4870X2 was only released in August 2008. Wolfram Alpha says, that that amount of money could power your system for 2 years, 3 months nonstop.

My, my, you racked up quite some computations there :O

25 points

·
10th Jul 2011

25 points

·
9th Mar 2011

As naughtius pointed out, it's not actually heading towards Alpha Centauri. The first star it will pass "close" to (close = 1.6 light years) is AC+79 3888 . This will happen in 309,600 years.

**edit** My value disagrees with the value on the Wiki page of the star, because the star is actually moving towards us. Taking this into account it will be much less, around 40,000 years according to Wiki. Someone who's not supposed to be doing real work could check this.

24 points

·
11th Aug 2011

24 points

·
31st May 2021

21 in Scotland and I've already been asked to put my name on the register for an appointment. Just waiting for the text now.

24 points

·
12th May 2021

This is cool, but the "Hot Streak" feature felt broken. So naturally I did the math.

Default average PC to-hit chance is ~65% that they hit. That means they'd need to roll 7 on the die to hit most monsters, which is really convenient for this gimmick.

By default, Critical Hits are 5% likely to hit.

Statistically, there's a 11% chance they roll 7 or better 6 times in a row if you make the auto-crit trigger on 7+ only. However, since you're adding +1 to hit every time, the trend will statistically be nearly 90% likely to trigger the auto-crit every 3 turns.

If you get rid of the +1 attack/damage rolls, and increase the streak to require 8, it's about 5-6% chance of making it. I know this ruins the whole 7's thing, but greatsword crits aren't screwing around. If you do go for the 7 charges, I'd put this on a longsword or Greataxe instead to mitigate some of the damage.

24 points

·
22nd Apr 2011

Can somebody help me out here? I don't quite understand that counter. For starters, it's at 99.5%, which is less than 99.95%. Secondly, 0.05% of downtime in a year is about four and a half hours right?

23 points

·
11th Jul 2011

(a*b)^n =a^n * b^n is only a property when you have positives (technically nonnegative reals), as the "primary" solution to these problems is always positive (ex. square roots of positive numbers are always positive).

When a and b can be nonpositives, then your solutions can start branching out in different directions, which causes some trouble when you multiply them back together.

Consider, for example, that (-1 * -1)^(1/2) != (-1)^(1/2) * (-1)^(1/2), as the former is just the square root of 1 (which is 1) and the latter is i^2 = -1.

Since WolframAlpha uses a nonreal principle branch for radicals of negative numbers (there are reasons why this makes sense), you end up getting a similar phenomenon with your inputs.

23 points

·
30th Jun 2011

A black hole with the mass of the earth would have an event horizon radius of 8.87 mm.

23 points

·
15th Jun 2011

Actually, it'd be free at 62,700 likes.

You'd have about a 133% discount at 0 people, which means they'd be *paying* you to buy the game.

23 points

·
27th Nov 2021

One board foot is a piece of wood 12 inches long, 12 inches wide and 1 inch thick. It’s a measure of volume, so you can shape it anyway you want, 6 inches wide, 24 inches long, 1 inch thick is still one board foot.

23 points

·
6th Mar 2011

We Americans have shit for infrastructure for trains / public transport and our nation is larger than your continent. And less populated in the central areas.

http://www.wolframalpha.com/input/?i=Size+of+united+states+versus+size+of+Europe

23 points

·
17th Apr 2020

If the dog is 10 lbs, you'd need 371 11" balloons to lift it. Plus, you can tell by the irregular/halting/unsmooth speed of lift. https://www.omnicalculator.com/everyday-life/helium-balloons

23 points

·
28th Jun 2018

The tackle was mostly vertical, so the vast majority of the force of impact would have been the result of gravity, of which Io apparently only has 0.183G, slightly more than our moon at 0.16G.

Bobby falls for 4.6 seconds in that clip, on Io falling for 4.6 seconds would cover a distance of 19 meters. At the moment you hit the surface you would be traveling at 8.26m/s (using https://www.omnicalculator.com/physics/free-fall).

Being hit with a car at 20mph (8.94 m/s) yields a 90% survival rate for someone not wearing any sort of protection. Bobby's 8.26m/s translates to 18.47mph.

Bobby given the data we are shown would almost always survive that fall.

Basically the fall in the show is stylized to look more exciting and dangerous than it really would have been, the footage makes it look like far more than a 19 metre drop is taking place and that she is hitting at way more than 18.47mph.

I make no claims about Diogo surviving or not, but the clip from the show is not really proof that the armour can allow people to suffer huge fall damage, when a regular person without armour would stand a good chance of surviving the same fall conditions.

23 points

·
20th Feb 2011

The video states at 1:41 that the star is 2.8 billion kms in diameter.

Wolfram Alpha states that Uranus is approximately 20.1 AU in distance from our Sun which works out to be about 3 billion kms, give or take a poofteenth.

Dropping VY Canis Majoris where our Sun should be will put Uranus about 200 million kms out and make it noticeably warmer.

22 points

·
30th Apr 2021

Using atomic weight here wouldn't make a ton of sense, since the atomic weight would be pretty much the weight of the protons and neutrons added together...in other words very, very small.

But apparently the typical size of a testicle is around 4cm x 3cm x 2cm, which means it has a total volume of 12.566 cm^3. The density of steel is 8.05 g/cm^3, so his nutsack would weigh approximately 202.31g (0.44 lbs) with a solid steel set of nuts.