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8 March, 20:57

A 200g block on a 50cm long string swings in a circle, it's frictionless and 75rpm. What is its speed and tension on string

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  1. 8 March, 23:36
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    Angular velocity = (75x2pie) / 60

    =2.5pie ras^-1

    linear velocity (or speed) at end of string, v = radius x angular velocity

    v = 0.5 x 2.5pie

    v=3.93 ms^-1

    tension of string (I beleve is centeral force aplied by string), F = (mv^2) / r

    F = (0.2 x 3.93^2) / 0.5

    F=6.18 N

    (sorry if wrong)
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