It seems possible to extract energy from the ambient air without temperature gradients (or at least with very small local gradients that will always be available). Being curious about this, I checked out some other threads and did not really find the specific question. (I did find some...
I then started thinking about the case of a rocket engine, and decided that in that case change kinetic energy was relative to the rocket and not some other frame of reference. As it turns out, the kinetic energy is relative to any frame of reference. Here is an excellent treatment of the...
I should have done this before I asked, but in case it might be useful to someone else, here is an easy example:
Example:
1. bigbox has a mass of 5 kg.
2. littlebox has a mass of 1 kg.
3. we apply a constant horizontal force of 1 Newton to each of them for a duration of 1 second.
4...
Hello Everyone,
I am sure that I am missing something obvious here. It might have to do with the fact that force is more explicitly defined as the derivative of momemtum. Anyway, can anyone explain why the following example seems to violate one of the two equations for work? (thanks in...