Question

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?

Answer 1

Speed= 100 rev/1 min=(1/4rev)/x min

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