Math CentralQuandaries & Queries


Question from Mary, a student:

The engine of a sports car rotates at 5000 revolutions per minute (rpm). Calculate the angular speed of the engine in radians per second.

Hi Mary,

One revolution is 2 π radians so 5000 revolutions is 2 π × 5000 = 10000 π radians. Hence the car engine is rotating at 10000 π radians per minute. How many seconds are in a minute? 10000 π radians per minute is how many radians per second?


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