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comment Why is there not always a force in the direction of motion?
"Consider the motion of the bear only after it has left the girl's hand".
Feb
4
awarded  Nice Answer
Feb
4
comment How much force is required to lift the back of a 2,480 lb car in the air from the bumper?
Note: This seems to be more than twice what Olympic record weightlifters briefly lift.
Feb
4
answered When were quarks discovered?
Feb
4
answered Why am I not shocked when I touch a tree, and the tree touches a power line?
Feb
4
awarded  Nice Answer
Feb
4
revised How do I experience Earth's movement?
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Feb
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revised How do I experience Earth's movement?
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revised How do I experience Earth's movement?
added 51 characters in body
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comment How do I experience Earth's movement?
@Harry: You just need to measure the rotational period of the Earth. You could do this using a Foucalt pendulum but it is easier to do so by measuring the interval from one sunrise to next. Then measure Earth's radius. You travel at a speed of 2 π r / day. For more exact measurements you need to take into account numerous other factors but this is a good start
Feb
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revised How do I experience Earth's movement?
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revised How do I experience Earth's movement?
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revised How do I experience Earth's movement?
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revised How do I experience Earth's movement?
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revised How do I experience Earth's movement?
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Feb
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answered How do I experience Earth's movement?
Feb
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comment Hawking radiation for an observer at infinity
If you were infinitely far from the star, wouldn't you have to wait an infinite time before you could see it?
Feb
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revised How to attract liquid metal with magnets
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Feb
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answered How to attract liquid metal with magnets
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comment What's the purpose of capacitors in parallel
@Ruslan: It probably doesn't make sense to work that way, no more than it makes sense to work out the equivalent circuit of a power supply before a dead-short on its outputs.