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Forces and Torques: Net torque applied to the cable car.

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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 drawing. The turntable is rotated one-half of a revolution to turn the car around. If the length of the car is 9.40 m and each person pushes with a 170 N force, what is the magnitude of the net torque applied to the car?

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The solution calculates the magnitude of the net torque applied to the car.

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The torque is calculated as tau = r x F = Fr sin(theta)

First take a look the torque applied by each of ...

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