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The angular speed on a fly wheel moving with uniform angular acceleration changes from 1200rpm to 3120rpm in 16 seconds. The angular acceleration in $rad/s^{2}$ is:
Explanation
Angular acceleration, $\alpha = \Delta w/\Delta t = 2\pi(f_{2} - f_{1})/\Delta t = 2\pi(52 - 20)/16 = 2\pi \times 32/16 = 4\pi$