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If a flywheel makes 120 revolutions/minute, then its angular speed will be:

1. 8π rad/sec
2. 6π rad/sec
3. 4π rad/sec
4. 2π rad/sec

Correct answer: 6π rad/sec

Solution

The angular speed is calculated as ω = 2π × (revolutions per second). Converting 120 revolutions/minute to revolutions/second gives 120/60 = 2 revolutions/second. Thus, ω = 2π × 2 = 4π rad/sec.

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