[填空题]
A small 650-gram ball on the end of a c lbu *fqo jsi4lim6drbsw:6 +yt.9)8 thin, light rod is rotated in a horizon+4lx,p; levy )a z;mxu5k5ik wtal cirm4ux;ay 5 5x ep+wl; iz)vklk,cle 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
