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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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The graphs in give the x-component of force acting on a particle moving along an x-axis. Rank them according to the work done by the force on the particle from to , from most positive work first to most negative work last.
In Fig, a block of cheese lies on the floor of a elevator cab that is being pulled upward by a cable through distance and then through distance . (a) Through , if the normal force on the block from the floor has constant magnitude , how much work is done on the cab by the force from the cable? (b) Through , if the work done on the cab by the (constant) force from the cable is , what is the magnitude of?
A force acts on a particle as the particle moves along an x axis, within newtons, x in meters, and c a constant. At x=0, the particle鈥檚 kinetic energy is 20 .0 J; at x=3.00 m, it is 11.0 J. Find c.
In Fig., a block of ice slides down a frictionless ramp at angle while an ice worker pulls on the block (via a rope) with a force that has a magnitude of and is directed up the ramp. As the block slides through distance along the ramp, its kinetic energy increases by . How much greater would its kinetic energy have been if the rope had not been attached to the block?
In Fig.7-47 , a cord runs around two massless, frictionless pulleys. A canister with mass m 20 kg hangs from one pulley, and you exert a force on the free end of the cord. (a) What must be the magnitude of if you are to lift the canister at a constant speed? (b) To lift the canister by 2.0 cm , how far must you pull the free end of the cord? During that lift, what is the work done on the canister by (c) your force (via the cord) and (d) the gravitational force? (Hint: When a cord loops around a pulley as shown, it pulls on the pulley with a net force that is twice the tension in the cord.)
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