A stroboscope is a light that flashes on and off at a, Ask an Expert

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A stroboscope is a light that flashes on and off at a constantrage. It can be used to illuminate a rotating object, and ifthe flashing rate is adjusted properly, the object can be made toappear stationary.

(a) What is the shortest time betweenflashes of light that will make a three-bladed propeller appearstationary when it is rotating with an angular speed of 16.7 rev/s?

(b) What is the next shortest time?

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