A stroboscope is a light that flashes on and off at a constantrate. It can be us

Question

A stroboscope is a light that flashes on and off at a constantrate. It can be used to illuminate a rotating object, and if theflashing rate is adjusted properly, the object can be made toappear stationary. (a) What is the shortest time between flashes of light thatwill make a three-bladed propeller appear stationary when it isrotating with an angular speed of 12.4 rev/s? ____s (b) What is the next shortest time? ____s A stroboscope is a light that flashes on and off at a constantrate. It can be used to illuminate a rotating object, and if theflashing rate is adjusted properly, the object can be made toappear stationary. (a) What is the shortest time between flashes of light thatwill make a three-bladed propeller appear stationary when it isrotating with an angular speed of 12.4 rev/s? ____s (b) What is the next shortest time? ____s

Explanation / Answer

Part A) the frequency is 12.4rev/s, so the period is T=1/f=1/12.4=.0806seconds. but since there are 3 blades on the propeller, itwill have the same orientation every 1/3 of a revolution. sothe minimum time is .0806*1/3=.0269seconds Part B) The propeller will also have the same orientation every 2/3 of arevolution, so the next shortest time is .0806*2/3=.0537seconds

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