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System of Particles and Rotational Motion
Rotational Kinematics
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Concepts tested
- angular acceleration from rpm
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2022 1 question
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The angular speed of a fly wheel moving with uniform angular acceleration changes from 1200 rpm to 3120 rpm in 16 seconds. The angular acceleration in $rad/s^2$ is :$\omega = \omega_0 + \alpha t \Rightarrow \alpha = \frac{\omega - \omega_0}{t}$ $\alpha = \frac{(3120 - 1200)}{16}$ rpm per s $= \frac{1920}{16} \times \frac{2\pi}{60}$ rad/$s^2$ $= 4\pi$ rad/$s^2$