A small $350-$gg ball on the end of a thin, light rod is rotated in a horizontal circle of radius $1\mathrm{.}4$ mm$.$ Ignore air resistance on the rod and its moment of inertia. Calculate the moment of inertia of the ball about the center of the circle. Calculate the torque needed to keep the ball rotating at constant angular velocity if air resistance exerts a force of $0\mathrm{.}040$ NN on the ball.$$