[填空题]
A small 650-gram bal/l ke8h d9-u:hlun es do:,2e( y/vonll onx9twsl:5*pv *af(r bo;dvh2 k the end of a thin, light rod is rotated in a horizontal circle of h v sor d2x;5a*pl*wfv9(b:tkradius 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
