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Chapter 8: Q111P (page 211)
A 9.40 kgprojectile is fired vertically upward. Air drag decreases the mechanical energy of the projectile-Earth system by 68.0 kJduring the projectile’s ascent. How much higher would the projectile have gone were air drag negligible?
The height is h=738 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?
During a rockslide, a 520 kgrock slides from rest down a hillside that islong and 300 mhigh. The coefficient of kinetic friction between the rock and the hill surface is 0.25. (a) If the gravitational potential energy Uof the rock–Earth system is zero at the bottom of the hill, what is the value of U just before the slide? (b) How much energy is transferred to thermal energy during the slide? (c) What is the kinetic energy of the rock as it reaches the bottom of the hill? (d) What is its speed then?
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?
A horizontal force of magnitude 35.0 Npushes a block of mass 4.00 kgacross a floor where the coefficient of kinetic friction is 0.600. (a) How much work is done by that applied force on the block-floor system when the block slides through a displacement of 3.00 macross the floor? (b) During that displacement, the thermal energy of the block increases by40.0 J. What is the increase in thermal energy of the floor? (c) What is the increase in the kinetic energy of the block?
A stone with a weight of 52.9 Nis launched vertically from ground level with an initial speed of 20.0 m/s, and the air drag on it is 0.265 Nthroughout the flight. What are (a) the maximum height reached by the stone and (b) Its speed just before it hits the ground?
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