A wheel rotating at 300 revolutions per minute has an angular speed of about
- A. 5 radians per second
- B. 31.4 radians per second
- C. 300 radians per second
- D. 1885 radians per second
Explanation
300 revolutions per minute is 5 revolutions per second, and each revolution is 2 pi radians, so omega is 5 times 2 pi, which is 31.4 radians per second. Forgetting to convert revolutions into radians leaves the answer as 5, the commonest error here. The value 1885 comes from using minutes rather than seconds.
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