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7 April, 19:41

The cable lifting an elevator is wrapped around a 1.2-m-diameter cylinder that is turned by the elevator's motor. The elevator is moving upward at a speed of 2.7m/s. It then slows to a stop, while the cylinder turns one complete revolution.

How long does it take for the elevator to stop?

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  1. 7 April, 21:26
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    C = PI*d = 1.2*PI meters

    2C = Vin*t

    t = 2C/Vin = 2.4*PI/2.7 = 0.88*PI in sec. (2.79 approx)
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