[填空题]
A small 650-gram ball on the end ofqd ;mh fkjg62*cz5 .iw a thin, lihf9q0fz//tkpf4 u:: 5zl w rdeght rod is rotated in a horizontal circle of radius 1./04ffr fhzz edu5k:9 wq/p l:t2 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
