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4 September, 02:54

A ball is orbiting counterclockwise at 100 revolutions per minute (rpm) around a circle of radius 10 cm. The center of the circle is at the x-y origin (0, 0). At t = 0, the ball is at (10 cm, 0). When does the ball first reach the y axis?

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  1. 4 September, 06:26
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    Speed = 100 rev/1 min = (1/4rev) / x min

    x = (1/400) min=60/400 sec=3/20=0.15 sec
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