Mastering Black Hole Energy to Solving Homework Problems | Expert Tips

[zzzaaaappp]

Homework Statement

I have a question about black holes and energy but have no idea what to do. if someone could just point me in the right direction.

the question asks to consider a mass spiraling into a black hole, starting with energy E=0 at infinity. I have to determine E of the object when orbiting the black hole at distance r classically. I'm just stuck right now, not sure what is wrong.

Homework Equations

what I am thinking;

T(r)= 1/2 Iw^2
U(r)= -GMm/r

there are following questions that I can't get to until i figure this out.

 

[chroot]

Your last equation is all you need. Note that this question actually has nothing to do with black holes; any normal mass will do just as well.

- Warren