[填空题]
A small 650-gram ball oub3vl6,5q j) ka :amytn the end of a thin, light rod is rotalv r- jgkn xij x,:n0m9v.06vq lx4i5hted in a horizontal cirvv: hl.r j j5in9vkn-m,60 xxix40q lgcle of radius 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
