Here's Why Mirrors Seem To Flip Things Sideways But Not Upside Down

February 18, 2015 3:52 PM

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Newton's Cannonball In this thought experiment, we're meant to imagine a cannon (elevated high enough so that its projectile will avoid hitting anything on Earth) that fires its cannonball at a 90 degree angle to the Earth below it. The diagram above shows several possibilities for the cannonball's flight, depending on how fast it's going at the moment of launch. If it's too slow, it will eventually fall back down to Earth. If it's too fast, it will escape Earth's gravitation entirely and head out into space. If it's somewhere in the middle, it will be sent into orbit. This realization was a landmark in the study of gravitation, and laid the groundwork for satellites and space flight.

Molyneux's Problem "Suppose a man born blind, and now adult, and taught by his touch to distinguish between a cube and a sphere of the same metal, and nighly of the same bigness, so as to tell, when he felt one and the other, which is the cube, which is the sphere. Suppose then the cube and the sphe...

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