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Chapter 4: Q10. (page 101)
How much tension must a cable withstand if it is used to accelerate a 1200 kg car vertically upward at 0.70 m/s2?
The tension in the cable is 12600 N.
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A bear sling (Fig. 4-40) is used in some national parks for placing backpackers’ food out of the reach of bears. As a backpacker raises the pack by pulling down on the rope, the force F needed
(a) decreases as the pack rises until the rope is straight across.
(b) doesn’t change.
(c) increases until the rope is straight.
(d) increases, but the rope always sags where the pack hangs.
Drag-race tires in contact with an asphalt surface have a very high coefficient of static friction. Assuming a constant acceleration and no slipping of tires, estimate the coefficient of static friction needed for a drag racer to cover 1.0 km in 12 s, starting from rest.
A small box is held in place against a rough vertical wall by someone pushing on it with a force directed upward at 28° above the horizontal. The coefficients of static and kinetic friction between the box and wall are 0.40 and 0.30, respectively. The box slides down unless the applied force has magnitude 23 N. What is the mass of the box?
A block is given a brief push so that it slides up a ramp. After the block reaches its highest point, it slides back down, but the magnitude of its acceleration is less on the descent than on the ascent. Why?
A skier moves down a 12° slope at constant speed. What can you say about the coefficient of friction,? Assume the speed is low enough that air resistance can be ignored.
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