[填空题]
A small 650-gram ball on tjmfu+l6p2zdr(gas-9z bh 2iuq,yg- :he end of a thin, light rod is rotated in a ho1lcn v x(*.vbyrizontal circle of radius 1.2 m. Calcula1xb.vvn *yc( lte (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
