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Unformatted text preview: mirror 5 times. Problem 22 (like 25.22): A laser beam for a barcode reader is shining on a mirror that rotates 100 times per second. What is the velocity of the laser spot on a cabbage that is 0.1 m from the axis of the mirror? a) 63 m/s; b) 126 m/s; c) 252 m/s; d) 504 m/s; e) 100 m/s. What do you know? The rotating mirror actually makes the light beam sweep across the cabbage twice per full rotation. So The laser spot is going around with an angular frequency of 200 times two pi per second = 400 pi per sec, although it only covers a 180 degree sweep. The velocity at a radius of 0.1 m is r times omega or 40 times pi m/s = 126 m/s....
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This note was uploaded on 09/23/2010 for the course PH 02c taught by Professor Mile during the Spring '04 term at Riverside Community College.
- Spring '04