Question

two pulleys of a car engine radius of 8 cm and 5 cm respectively are connected by a belt. The larger pulley rotates 80 times per minute. Find the angular velocity of each pulley in radians per minute.
Since the radii are in the ratio of 5/8, and they both move the same amount of belt, their speed is in the ratio 8/5.

So, what is 80 * 8/5 ?
128

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