[填空题]
A small 650-gram ball on the end o,wt7y n(xfm8bf a thin, ygejww,x sr ;asy*je2)uw;ui-y+ajno i)+ 8- light rod is rotated in a horizontal cirej+ju ysxw w ; +2aoyuesg,a)8;-ir -jyw) *incle 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
