What is the measure of the ability of a force to rotate or accelerate an object around an axis?

A. Centripetal Force
B. Level Arm
C. Axis of Rotation
D. Torque

Anybody wanna ? (picture included? )

Yvette hangs a 2.4kg bird feeder in the middle of a rope tied between two trees. the feeder creates a tension of 480 n in each side of the the rope.

Amoving electron has kinetic energy k1. after a net amount of work w has been done on it, the electron is moving one-quarter as fast in the opposite direction. (a) find w in terms of k1. (b) does your answer depend on the final direction of the electron's motion?