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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) If,andin Fig. 4鈥�53, determine the acceleration of each block. (b) If initially, it is at rest at 1.250 m from the edge of the table, how long does it take to reach the edge of the table if the system is allowed to move freely? (c) If, how large mustbe if the acceleration of the system is to be kept at?
A window washer pulls herself upward using the bucket鈥損ulley apparatus shown in Fig. 4鈥�48. (a) How hard must she pull downward to raise herself slowly at constant speed? (b) If she increases this force by 15%, what will her acceleration be? The mass of the person plus the bucket is 72 kg.
Draw the free-body diagram for a basketball player (a) just before leaving the ground on a jump, and (b) while in the air. See Fig. 4鈥�46.
What is the weight of a 68-kg astronaut (a) on Earth, (b) on the Moon(c) on Mars(d) in outer space traveling with constant velocity?
A small box is held in place against a rough vertical wall by someone pushing on it with a force directed upward at 28掳 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?
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