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Chapter 5: Problem 28
Movers slide a 73 -kg file cabinet along a floor where the coefficient of kinetic friction is \(0.81 .\) What's the frictional force on the cabinet?
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The handle of a 22 -kg lawnmower makes a \(35^{\circ}\) angle with the horizontal. If the coefficient of friction between lawnmower and ground is \(0.68,\) what magnitude of force, applied in the direction of the handle, is required to push the mower at constant velocity? Compare with the mower's weight.
A 15 -kg monkey hangs from the middle of a massless rope, each half of which makes an \(8^{\circ}\) angle with the horizontal. What's the rope tension? Compare with the monkey's weight.
Riders on the "Great American Revolution" loop-the-loop roller coaster of Example 5.7 wear seatbelts as the roller coaster negotiates its 6.3 -m-rudius loop at \(9.7 \mathrm{m} / \mathrm{s} .\) At the top of the loop. what are the magnitude and direction of the force exerted on a 60-kg rider (a) by the roller-coaster seat and (b) by the seatbelt? (c) What would happen if the rider unbuckled at this point?
The force of static friction acts only between surfaces at rest. Yet that force is essential in walking and in accelerating or braking a car. Explain.
A jet plane flies at constant speed in a vertical circular loop. At what point in the loop does the seat exert the greatest force on the pilot? The least force?
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