Assume that a 1.00-kg ball is thrown solely by the action of the forearm, which rotates about the elbow joint under the action of the triceps muscle, Fig. 8-46. The ball is accelerated uniformly from rest to 8.5 m/s in 0.38 s, at which point it is released.

Calculate

(a) The angular acceleration of the arm, and

(b) The force required of the triceps muscle. Assume that the forearm has a mass of 3.7 kg and rotates like a uniform rod about an axis at its end.

Transcribed Image Text:

31 cm Axis of rotation 2.5 cm (at elbow) Triceps muscle