[填空题]
A small 650-gram balltn,)iyz)e: q g ; v*t 40*ewyoifrjx5l on the end of a thin, light rod is rotat de(/ 5 br;jij*kk)/0qdhrx o8m7fhjied in a horizontal circle of radius 1.2j kmijq/ /irkf(h0* oerb78j)xd;d5 h 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
