[填空题]
A small 650-gram bal+c7 8q qp:s-oy4usgttl on the end of a thin, light rod is rotated in a horizontur3uw:ftzuumna3 rlnj(+ -( m: 2ecr4al circle of radius 1.2 m. Calculaz3 tumr4(aj23 uf+nrenru::w(cu ml -te (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
