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Chapter 7: Q23P (page 172)
In Fig. , a constant force of magnitude is applied to a shoe box at angle, causing the box to move up a frictionless ramp at constant speed. How much work is done on the box by when the box has moved through vertical distance ?
Work done on the box by applied force is .
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A 3.0 kg body is at rest on a frictionless horizontal air track when a constant horizontal force acting in the positive direction of an x axis along the track is applied to the body. A stroboscopic graph of the position of the body as it slides to the right is shown in Fig. 7-25. The force is applied to the body at t=0, and the graph records the position of the body at 0.50 s intervals. How much work is done on the body by the applied force between t=0 and t=2.0 s ?
A 1.5 kg block is initially at rest on a horizontal frictionless surface when a horizontal force along an x axis is applied to the block. The force is given by , where x is in meters and the initial position of the block is x=0. (a) What is the kinetic energy of the block as it passes through x=2.0 m? (b) What is the maximum kinetic energy of the block between x=0 and x=2.0 m?
Boxes are transported from one location to another in a warehouse by means of a conveyor belt that moves with a constant speed of 0.50 m/s. At a certain location the conveyor belt moves for 2.0 m up an incline that makes an angle of with the horizontal, then for 2.0 m horizontally, and finally for 2.0 m down an incline that makes an angle of ith the horizontal. Assume that a 2.0 kg box rides on the belt without slipping. At what rate is the force of the conveyor belt doing work on the box as the box moves (a) up the incline, (b) horizontally, and (c) down the incline?
A force acts on a 2.00 kg mobile object that moves from an initial position of role="math" localid="1657168721297" to a final position of in 4.00 s. Find (a) the work done on the object by the force in the 4.00 sinterval, (b) the average power due to the force during that interval, and (c) the angle between vectors role="math" localid="1657168815303" and.
In three situations, a single force acts on a moving particle. Here are the velocities (at that instant) and the forces: (1) (2) (3) . Rank the situations according to the rate at which energy is being transferred, greatest transfer to the particle ranked first, greatest transfer from the particle ranked last.
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