[填空题]
A small 650-gram balph 5 z /7kuj *havg.5g8h fq51pkmpfg;l orvsp7w-n:; fm0h k8kto wc6q /n the end of a thin, light rod is rotated in a horizontal circl: tm-hks;co068fqww p/ n rv7ke of radius 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
