(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

(a) Calculate the magnitude of the force, FM, required of the "deltoid" muscle to hold up the outstretched arm shown in the figure. The total mass of the arm is 3.3 kg.

(b) Calculate the magnitude of the force FJ exerted by the shoulder joint on the upper arm

http://www.webassign.net/gianpse4/12-56.gif

2. Relevant equations

3. The attempt at a solution

I got part a:

tnet=mg(24m)-Fmsin15(0.12m)=0

Fmsin15(0.12m)=(3.3kg)(9.8m/s^2)(0.24m)

Fm=(3.3kg)(9.8m/s^2)(0.24m)/0.03106m

Fm=250N

How do I figure out Fj for part b?

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# Homework Help: Arm problem, Static Equilibrium

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