The cable cars in San Francisco are pulled along their tracks by an underground

Question

The cable cars in San Francisco are pulled along their tracks by an underground steel cable that moves along 9.5mph. 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 upto 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 the figure. A m = 1900kg block is attached to the tensioning pulley's cart, via a rope and pulley, and is suspended in a deep hole. Part A What is the tension in the cable car's cable? Express your answer to two significant figures and include the appropriate units. T = Value _______ N

Explanation / Answer

The force on the pulley is due to g.
(1900 x g) = 18639N.
As you know nothing about friction and other forces in the entire cable run, you can only assume the tension is (18639/2) = 9319.5N. on average

If the cable goes 180

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