Recent content by Eolill

Could anyone explain the way gravitational waves (which arise when, for instance, two neutron stars are orbiting each other) and gravitomagnetism (when a heavy body spins and drags spacetime around with it) work?

Combining quantum mechanics with general relativity supposedly yields infinite gravitation, between the gravitons if I have understood this correctly (correct me if I'm wrong). String theory supposedly does away with this infinite gravitation -- my question is, how does it do this...

Thank you both very much! I believe I understand better now (or, for a couple of things, at least I understand what it is I don't know). ^^ You were very helpful.

So, hi. I am taking a course (astrophysics) for which we are required to write a paper (very freely, about 5 pages, no real limitations) about a subject related to, well, astrophysics. I chose gravitation because I guess I have always been fascinated by it. I realized rather quickly that...

But if the wall won't move, it can't have any momentum, can it? And if both ball and wall are infinitely hard, there will be no heat or sound upon impact, will there? What was said about the ball not bouncing back if it were infinitely hard, was very helpful, though. Thanks! <3

All right, so, we just went over linear momentum in school, and one thing is confusing me: If I throw something at a wall, why does it bounce back? (I'm assuming both the object and the wall are infinitely hard and don't get deformed, and the wall won't move) It seems pretty...

Drawing pictures and listing knowns/unknowns is great help. You know the mass, the height/displacement, and the velocity. These give you the initial kinetic energy and the final potential energy, and the initial energy is always equal to the final energy plus the work done by friction/air...