physics
posted by Mark .
A 650g ball on the end of a light rod is rotated in a horizontal circle of 1.2m radius.Calculate the torque needed to keep the ball rotating if the air resistance exerts a force of .02N on the ball. Ignore the moment of inertia and the air resistance of the rod.

Huh?
.02*1.2
Since speed is constant, no tangential acceleration and I is not relevant and m is not relevant.