A 4.0 kg, 36-cm-diameter metal disk, initially at rest, can rotate on an axle along its axis. A steady 5.5 N tangential force is applied to the edge of the disk.

What is the disk's angular velocity, in rpm, 4.0 s later?

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  1. wf=alpha*time

    where alpha=torque/momentinertia
    = 5.5*.36/(1/2 *4*.18^2)

    wf will be in rad /sec. to get rpm
    RPM=wf/2pi * 60/1=30wf/PI

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