[填空题]
A small 650-gram ball onz +jk5 g gtkak2(g4od1.x/uxv the end of a thrd((qdsrot0wz)t1al ks, ac2b0 ;( a w(a7 xwwin, light rod is rotated in a horizontal circle ofz(c(at( (rw0dl 2ba)wk a01;dsww ats7qxo,r 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
