A grindstone spinning at the rate of 8.3 rev/s has what approximate angular speed?
A)3.2 rad/s
B)26 rad/s
C)52 rad/s
D)81 rad/s

Question

Quizplus · Accepted Answer

To convert from revolutions per second to radians per second, we need to multiply by 2π, since there are 2π radians in one revolution. Thus, the angular speed of the grindstone is approximately 8.3 x 2π = 52 rad/s. Therefore, the answer is choice C.

A Grindstone Spinning at the Rate of 8