Assume that a 1.10-kg ball is thrown solely by the action of the forearm, which

Question

Assume that a 1.10-kg ball is thrown solely by the action of the forearm, which rotates about the elbow joint under the action of the triceps muscle, the figure. The ball is accelerated uniformly from rest to 8.6 m/s in 0.30 s , at which point it is released. Assume that the forearm has a mass of 3.7 kg and rotates like a uniform rod about an axis at its end. (Figure 1) Part A

Calculate the angular acceleration of the arm. Express your answer to two significant figures and include the appropriate units.

Part B

Calculate the force required of the triceps muscle. Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

angular acceleration=/t

partA

angular acceleration=/t
=8.6/0.30

=28.66

partB)

f=ma

=3.7x28.66

=106.06m

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