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Mar
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awarded  Popular Question
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Apr
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comment Why is jumping into water from high altitude fatal?
I think we're under-emphasizing how much kinetic energy that is. Let's try to put this in perspective: 787,500 J is enough energy to lift an F-150 pickup truck to the top of a 10 story building. That also means if you drop that pickup off a 10 story building into the water, the pickup would dissipate the same amount of energy as the human. And @user3058846 that means the impulse of force would be the same in those two situations. (And I'm thinking the pickup would hit the water pretty hard.)
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accepted How is antenna gain correlated to beam width?
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asked How is antenna gain correlated to beam width?
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answered Can you use a laser to measure the speed of light with a rotating mirror?
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