[填空题]
A small 650-gram ball onx)d4fs figgr8vaa6 *jw69w, 4gnb0pc7d rx0n7tn:y4aaa s wz :eg8)v the end of a thin, light rod is rotated in a horizontal circle of radius 1.2 m. Calculat4ny8:70 a:n7)a wzva g sredxte (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
