What are /r/physicsgifs' favorite Products & Services?

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I believe it's a bunch of tiny iron filings suspended in some sort of oil, squished between two sheets of plastic. The iron moves in relation to the magnetic field, letting you visualize magnetic field lines.

They're pretty cheap on Amazon.

Saw a guy at a music festival a few weeks ago wearing one of these as a bracelet and was definitely mesmerized! watching it crawl up and down his arm as he danced was fantastic and I wanted to ask him what it was or where he got it but lost him in the crowd before I could. So thanks for posting this with the name. That allowed me to find it on Amazon.

Wrong subreddit u/AgileStretch but That's the Clue Luxury Edition by Winning Solutions. They make pretty cool editions of classics.

https://www.amazon.com/Winning-Solutions-Foil-Stamped-Storage-Accessories/dp/B004SRWHFM/

I bet you are not from the US because "pipe cleaner" means something slightly different ( and no, I am not making a dirty joke). https://www.amazon.com/dp/B00A6VWMYK/ref=cm_sw_r_cp_apa_i_4SI4AbH4MVGCE

You're right. These are definitely not to scale, I posted this on the /r/educationalgifs xpost

>Nope, these are just examples very very exaggerated to show effect. The effects of the Earth and Sun is hardly perceptible.

>The center of mass (or barycentric coordinates) of Earth and the sun is roughly 450km (280 miles) from the sun's center. That's about .06% of the Sun's radius.

>Jupiter on the other hand is almost .1% of the Sun's mass. Their center of mass is about 740,000 km (460,000 miles) from the Sun's center. Meaning their center of mass is just outside the Sun's radius (by about 46,000km or 26,000 miles)

>Keep in mind though, it is a lot harder to determine this "wobble" than running numbers based on 2 bodies. Every object in the solar system has gravitation influence on the sun, and the sun on them. However detecting the wobble of stars is one method of finding exoplanets.

edit: spelling

edit2: Jupiter diameter is 10% of the Sun's diameter, not mass...

It's called a lissajous curve. It's best defined as a parametric function. An example is x=cos(5t) , y=sin(7t) EDIT: link to example. Try editting the coefficients (the 5 and the 7) to see different examples. Generally, the larger they are, the closer to a square it gets. https://www.desmos.com/calculator/aenq9gbrcq

I just searched Amazon, there are a bunch of different styles. They mostly cost around $50.

Here is one that looks pretty similar to OP for under $30.

> tommestok

Google says yardstick. But yeah, there's no specific name for a folding yardstick or ruler in english. The equivalent tool in the "English" world would probably be a "tape measure".

The air being directed downward creates lift due to Newton's 3rd law. The Coanda effect helps turn the air downward as it follows and departs the curved wing. When the flow separates from the wing it is no longer deflected and the wing stalls.

https://www.slideshare.net/worldwidewhoswho/the-coanda-effectandlift

That is not the type of bird toy he is referring to. That "drinking bird" does not balance on its beak.

This is what he means:

https://www.amazon.com/Toysmith-4035-Balancing-Eagle-7-Inch/dp/B004R6VB2E

I believe the plans are online for 3D printing. Had OP referenced the post where he got it from, you might have been able to see the link.

e: https://cults3d.com/en/gadget/straight-pole-curved-hole-illusion

> In knowing yourself you have defeated your enemy.

“If you know the enemy and know yourself, you need not fear the result of a hundred battles. If you know yourself but not the enemy, for every victory gained you will also suffer a defeat. If you know neither the enemy nor yourself, you will succumb in every battle.”

― Sun Tzu, The Art of War

Goodreads' Sauce.

It runs perfectly on Mac.

Head on over to /r/openrct2

Installation is as easy as:

1. Download OpenRCT2
2. Open the app
3. Point it at the RCT2 supporting files
4. Play.

The method described in Richardson 1990. I don't know why I assumed that there weren't more modern methods to solve it.

Not too difficult with a lathe and careful measurements.

You can buy a really high-end one here though.

This page as some good ones too

Baseball Enlightenment. It's a baseball video game I developed for Android devices, which you can download for free if interested!