A 64kg wheel with radius 2.4m is rotating at 280rev/min. If you want to stop it in 30sec. (use point mass of moment of inertia) A. How much work must be done to stop it? B. What is the required power?

In the sport of parasailing, a person is attached to a rope being pulled by a boat while hanging from a parachute-like sail. a rider is towed at a constant speed by a rope that is at an angle of 15 ∘ from horizontal. the tension in the rope is 1900 n. the force of the sail on the rider is 30∘ from horizontal. what is the weight of the rider? express your answer with the appropriate units.

Two vectors are shown. which statement best compares the vectors? vector x has greater magnitude than vector y. vector y has greater magnitude than vector x. the vectors have the same displacement. the vectors have the same direction.

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity