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Chapter 8: Q100P (page 211)
A swimmer moves through the water at an average speed of 0.22 m/s. The average drag force is 110 N. What average power is required of the swimmer?
The stopping distance of an automobile is 100 m.
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The temperature of a plastic cube is monitored while the cube is pushed 3.0 macross a floor at constant speed by a horizontal force of 15 N. The thermal energy of the cube increases by 20 J. What is the increase in the thermal energy of the floor along which the cube slides?
In Fig.8.51, a block slides down an incline. As it moves from point Ato point B, which are 5.0 m apart, force acts on the block, with magnitude 2.0 N and directed down the incline. The magnitude of the frictional force acting on the block is 10 N . If the kinetic energy of the block increases by 35 J between Aand B, how much work is done on the block by the gravitational force as the block moves from Ato B?
In Fig 8-33, a small block of mass can slide along the frictionless loop-the-loop, with loop radius . The block is released from rest at point P, at height above the bottom of the loop. How much work does the gravitational force do on the block as the block travels from point Pto a) point Q(b) the top of the loop?If the gravitational potential energy of the block–Earth system is taken to be zero at the bottom of the loop, what is that potential energy when the block is (c) at point P (d) at point Q (e) at the top of the loop? (f) If, instead of merely being released, the block is given some initial speed downward alongthe track, do the answers to (a) through (e) increase, decrease, or remain the same?
A 0.42 kgshuffleboard disk is initially at rest when a player uses a cue to increase its speed to 4.2 m/sat constant acceleration. The acceleration takes place over a 2.0 mdistance, at the end of which the cue loses contact with the disk. Then the disk slides an additional 12 mbefore stopping. Assume that the shuffleboard court is level and that the force of friction on the disk is constant. What is the increase in the thermal energy of the disk–court system (a) for that additional 12 mand (b) for the entire 14 mdistance? (c) How much work is done on the disk by the cue?
In Fig. 8-25, a block slides along a track that descends through distance h. The track is frictionless except for the lower section. There the block slides to a stop in a certain distance Dbecause of friction. (a) If we decrease h, will the block now slide to a stop in a distance that is greater than, less than, or equal to D? (b) If, instead, we increase the mass of the block, will the stopping distance now be greater than, less than, or equal to D?
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