[填空题]
A small 650-gram ball on the e,ssys 6ysxl4+ i4n ye1nd of a thin, likqclr, ea 5:kyb0 f74bxnenp/)m6wm(ght rod is rotated in a horizontal circle of radius 1.acew7b pn (y/ xb0mfem4kl 65kn,)rq: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
