Physics for Scientists and Engineers: A Strategic Approach 5th Edition · Newton's Third Law · Problem Exercise_20
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Randall D. Knight — Newton's Third Law: Problem Exercise_20
The cable cars in San Francisco are pulled along their tracks by an underground steel cable that moves along at 9.5 mph. The cable is driven by large motors at a central power station and extends, via an intricate pulley arrangement, for several miles beneath the city streets. The length of a cable stretches by up to 100 ft during its lifetime. To keep the tension constant, the cable passes around a 1.5-m-diameter “tensioning pulley” that rolls back and forth on rails, as shown in FIGURE EX7.20. A 2000 kg block is attached to the tensioning pulley’s cart, via a rope and pulley, and is suspended in a deep hole. What is the tension in the cable car’s cable?
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주어진 조건: 100 ft, 7.20. A, 2000 kg
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Physics for Scientists and Engineers: A Strategic Approach · 5th Edition
저자: Randall D. Knight
출판사: Pearson
단원: Newton's Third Law