Recent content by NickPerry

My apologies, I probably shouldn't have used the word 'efficiency' and the only reason I did is because if you have an air conditioner inside a room with no way for it to vent out, the amount of heat it outputs would be greater than the amount it can cool. what sparked this question was the...

wow, I should probably check this forum more often, Thank you for the answers (although they are perhaps not what I want to hear :p) "The phonovoltaic cell runs into the problem that high energy phonons get converted into multiple low energy phonons, lowering the efficiency. In fact, the pV...

of course right after I post this I find the answer I'm looking for. apparently it sort-of exists, and it's called a phonovoltaic (https://en.wikipedia.org/wiki/Phonovoltaic) which converts the lattice vibrations into energy, but apparently it only works in high energy environments, in a narrow...

ok, we have a really efficient way to make heat (adding energy into a system) all we have to do is pass a current through a high resistance wire, boom, close to %100 heat generation. however, from what I can tell there is no way to create coolness (take energy away from a system) like that. we...

Whoops. I must have glanced over that. how about this (where I originally got stuck on) the acceleration of a flashlight in space: https://www.reddit.com/r/askscience/comments/dofov/does_a_flashlight_produce_thrust/ 1Kg 3watt = 10 ^ -8 Newton's of force. for 20 hours (27000 seconds) how did...

This should be a painfully simple question, and yet, I can't find the answer. once you have calculated the net acceleration force of an object, how do you figure out how fast it will be going over X seconds? example (taken from here...