Hey, any ideas on this double starred, hard question :( A golf ball passing trhough a windmill at a miniature golf course. The windmill has 8 blades and rotates at an angular speed of 1.25 rad/s clockwise. The opening between successive blades is equal to the width of a blade. A golf ball of diameter 4.50x10^-2 m is just passing by one of the rotating blades. What must be the minimum speed of the ball so that it will not be hit by the next blade? Ok, my thought is, I need to find time for a blade to rotate theta, and I need the arc length for that. With arc length I have some way to compare the diameter and the space opening between the ball and blade. Lost from that point... :yuck: Any ideas, Great!