Matthew starts from rest on top of 8.45 m high sledding hill. he slides down the 32-degree incline and across the plateau at its base. the coefficient of friction between the sled and snow is 0.128 for the plateau and the hill is frictionless. matthew and the sled have a combined mass of 27.5 kg. determine the distance which matthew will slide along the level surface of the plateau before coming to a complete stop.

Inside of a windmill or a dam is a that is used to transform one type of energy into electrical energy. a. motor b. generator c. transformer d. power pack

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.

The inverse square law applies to: intensity of sound gravitational force intensity of light electric force magnetic force