[填空题]
Assume that a 1.00-kg ball is thrown solely by the actio fv:ccn,3doii .cd5cnbg( : y/n of the forearm, whi mh u8a2j/ ov(k3gaw9uch rotates about the elbow joint under the ac8a wju9ko2agmvh/( 3u tion of the triceps muscle, Fig. 8–45. The ball is accelerated uniformly from rest to 10 $m/s$ in 0.350 s, at which point it is released. Calculate
(a) the angular acceleration of the arm, $rad/s^2$
(b) the force required of the triceps muscle. Assume that the forearm has a mass of 3.70 kg and rotates like a uniform rod about an axis at its end. N
