Recent content by ccarit3007

Homework Statement Uniform rod rotates at axel. What is the total kinetic energy of the rod? Homework Equations deltaKrot = 1/2Iw^2 deltaKtrans = 1/2mv^2 The Attempt at a Solution I believe the rod has both rotational as well as translation energy because the rod is not rotating about its...

Ah thinking about this again, the net force which would be directed towards the star would have a component that is in the direction of the momentum. Is this correct?

Yes, I understand that. So when you are not at point A or point D the force will not be perpendicular to the velocity (and momentum). I'm not sure exactly what this means/where I go from there? I'm guessing that means the work at A & D is 0?

If a comet is orbiting a star is there any work done? I understand that work is force * displacement, but the force must be in the direction of motion. In the case of a comet and star the star exerts a gravitational force on the comet, but this force is not in the direction of the motion of the...