# Dynamics of Rotational Motion

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7.2Dynamics of Rotational Motion

## Dynamics of Rotational Motion Revision Questions

1) What is the angular momentum of a 3 kg cylinder rotating at 2 rad/s around its central axis of symmetry as shown in the figure? Take the radius of cylinder R = 40 cm and its height h = 2 m. 1. 0.24 kg × m2 / s
2. 0.48 kg × m2 / s
3. 0.96 kg × m2 / s
4. 1.12 kg × m2 / s

2) What is the mass of a 2 m bar rotating around its centre as shown in the figure if its rotational kinetic energy is 8 J and it rotates uniformly at 0.4 rad/s? 1. 75 kg
2. 100 kg
3. 300 kg
4. 1200 kg

3) A 1.6 m bar rotates at 0.6 rot/s around its centre when a 20 N force is used horizontally as shown in the figure. What is the power delivered by the source?

1. 9.6 W
2. 16 W
3. 26.7 W
4. 32 W

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5. Continuing learning rotation - read our next physics tutorial: Centripetal Force

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