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In San Francisco a very simple technique is used to turn around a cable car when

ID: 2028895 • Letter: I

Question

In San Francisco a very simple technique is used to turn around a cable car when it reaches the end of its route. The car rolls onto a turntable, which can rotate about a vertical axis through its center. Then, two people push perpendicularly on the car, one at each end, as in the figure. The turntable is rotated one-half of a revolution to turn the car around. If the length of the car is 9.41 m and each person pushes with a 185-N force, what is the magnitude of the net torque applied to the car?

Explanation / Answer

Force F = 185 N Length of the car L = 9.41 m The magnitude of the net torque applied to the car = FL                                                                                = 1740.85 Nm
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