[填空题]
A small 650-gram ball on the end of a thin,+vf .d0n cd yqlk-5r*o l-kkmlv4w8e mzmx 24 b3ight rod is rotated in a horizontal circle of radius 1xkm28lm-km4w3 e4 vzb .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
