[填空题]
A small 650-gram ball on the end of a thin, light ;gbuw -p02 /xus t8p +s9dkpdyrod is rotat v4w5e- obzh7bed in a horizontal circle of rhe4b5zbw7- vo adius 1.2 m. Calculate (a) the moment of inertia of the ball about the center of the circle, $kg \cdot m^2$ (b) the torque needed to keep the ball rotating at constant angular velocity if air resistance exerts a force of 0.020 N on the ball. Ignore the rod’s moment of inertia and air resistance. $m \cdot N$
Post time 2025-2-18 20:00:22
