AP Physics Help





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Discus: SAT/ACT Tests and Test Preparation: October 2003 Archive: AP Physics Help
By Justice (Justice) on Monday, October 20, 2003 - 11:10 am: Edit

It's supposed to be really easy. I don't know what I'm doing right now though. If any of you are also using Halliday et al's Fundamentals of Physics 6th ed., it's #41 and #45 in Chapter 8. Otherwise, here.
Thanks so much.

1) A 3.57kg block is drawn at constant speed 4.06m along a horizontal floor by a rope. The force on the block fromt he rope has a magnitude of 7.68N and is directed 15.0 degrees above the horizontal. What are (a) the work done by the rope's force, (b) the increase in thermal energy of the block-floor system, and (c) the coefficient of kinetic friction between the block and floor?

2) A 60kg skier leaves the end of a ski-jump ramp with a velocity of 34 m/s directed 25degrees above the horizontal. Supposed that as a result of air drag the skier returns to the ground with a speed of 22m/s landing 14m vertically below the end of the ramp. From the launch to the return to the ground, by how much is the mechanical energy of the skier-Earth system reduced because of drag?


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