A disk rotates about its central axis starting from rest and accelerates with constant angular a...

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A disk rotates about its central axis starting from rest and accelerates with constant angular acceleration. At one time it is rotating at \( 10 \mathrm{rev} / \mathrm{s} ; 60 \mathrm{revolutions} \) later, its angular speed is \( 15 \mathrm{rev} / \mathrm{s} \). Calculate
the time required to complete the 60 revolutions,
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