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3 September, 23:41

A coin of mass 0.05 kg is placed at a radius r = 0.1m meter on a horizontal turntable which is turning uniformly at a rate of one revolution every 1.5 s. The coin does not slip. The net force on the coin is?

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  1. 4 September, 00:59
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    Answer:F=0.0882kg

    Explanation:

    The period it takes to make one revolution is 1.5 seconds / revolutions,

    v = r * (change in angle / change in time)

    the change in angle is 2pi, for one whole revolution. the time is 1.5 second per revolution, and the radius is 0.1.

    v = (2 * pi * 0.1 cm * / 1.5second

    v = 0.42m/s

    a=v^2/r

    a=0.42^2 / 0.1 = 1.764m/s2

    F=ma

    F=0.05*1.764

    F=0.0882kg
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