[填空题]
A small 650-gram ball on the end of a thin, light rod is,p,f x20q oaow 73nmis rotated in a horiz ; 7wih*b(hvf xrr3cr, q-wit9ontal circle of radius 1.2 m. Calculaqrhbh-i;t7 c r*3x (,fwvr9i wte (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
