Recent content by Reverie29

I feel like I'm missing something, specifically in regard to the total amount of work. Can someone set me straight? Homework Statement Suppose you lift a heavy weight from the floor to high over your head and let it fall back to the floor. An observer says you did no work because it wound...

I have no idea why it increased! I guess I must be calculator retarded. I've got it now, thanks!

Okay. The density of a sphere is = 3M / 4(pi)r^3. And I have already solved for M/r^3. I tried multiplying by 3 and dividing by 4pi, but still got an incorrect answer. I got 17,356 kg/m^3. Should I be looking at another equation?

Homework Statement A satellite is in a circular orbit very close to the surface of a spherical planet. The period of the orbit is 2.49 hours. What is density of the planet? Assume that the planet has a uniform density. Homework Equations T^2 = (4(pi)^2*r^3) / GM The Attempt at a...