[填空题]
A small 650-gram ball on the end of a thiiso(n9.xkq km1t dn)3hw/q y1d0w 1 6yb-/5vwzu, 8ntwekpxmn, light rod is rotated in a horizontal circle of radi0bydz1 pwe vw,6 uk-5 m8nwx/tus 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
