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First of all, from the ship's point of view, everything about the star is proceeding at a reduced rate of speed, relative to what the ship would expect for a star at rest in its frame. Not only is the …

First just a comment on the wording: Feynman says you need to remove "a little weight," not "little weights." I picture this as using a knife to shave a small amount of mass from one of the cubes. Of …

Note: This answer is probably cheating from a logical perspective, since I think that Feynman is trying to use his example to justify the principle I am using. However, I think it can be useful pedago …

In practice, it is a much more common situation that you would want to use a small amount of force (and a long lever arm) to produce a very large force that can lift a very heavy mass, than vice versa …

If you shine a laser with many photons into two slits and observe the diffraction pattern on a screen, then you can indeed use Maxwell's equations (with no quantum theory) to explain the result. Howev …

The way this machine works is by conservation of angular momentum. The torque provided by the three boxes (aka weights, aka units) on the left hand side balances the torque provided by the box on the …

Any realistic observable is local, since any experiment will take place in a finite region of spacetime. One often doesn't need to worry about this in non-relativistic QM, but in relativistic QM (ie, …

The words "ordered" and "disordered", in relation to entropy, are the source of a lot of confusion and are not even always an accurate description. In your coin example, a more typical use of the word …