[填空题]
Assume that a 1.00-kg ball is thrown solely by the actio fid- +;uz ;li jabx8itao/x70n of the forearm, whiwy(gym p1( vs-ch rotates about the elbow joint under the action o( p1y -gwsv(ymf 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
