Work
The figure above shows constant forces and acting on a box as the box slides rightward across a frictionless horizontal floor. Force acts horizontally leftward with a magnitude of Force is applied in a direction that makes a angle with the floor with a magnitude of The speed of the box at a certain instant is What is the net power acting on the box?
A skier is pulled by a towrope up a frictionless ski slope that makes a angle with the horizon. The rope moves parallel to the slope at a constant speed of The rope does of work to the skier as the skier moves a distance of up the incline. If instead the rope moved at a constant speed of , while the skier moves the same distance, with how much power would the rope do work to the skier?
A cactus initially at rest accelerates uniformly for seconds. If the cactus' speed after the acceleration is what is the instantaneous power with which work is done to the cactus, just before the end of its acceleration?
A freight elevator is loaded with a cab with a total mass of which is required to travel upward in seconds, starting and ending at rest. The elevator's counterweight has a mass of only so the elevator motor must help. With how much power must the motor do work to the cab?
The gravitational acceleration is
A block is pulled at constant speed of across a horizontal floor by an applied force of magnitude in a direction that makes a angle with the floor. With how much power does the force do work on the block?