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9 January, 00:25

A flywheel with a very low friction bearing takes 1.6 h to stop after the motor power is turned off. The flywheel was originally rotating at 55 rpm. What was the initial rotation rate in radians per second?

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  1. 9 January, 00:47
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    Answer: 5.76 rads/s

    Explanation:

    The initial rotation is 55 rpm

    1 rev = 2π radians

    55 revs = 55 * 2π/1 = 345.58 radians/min

    345.58 rads/min = 345.58rads/60s = 5.76 rads/s
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