Moments WRT Forearm

1. The problem statement, all variables and given/known data

Figure 5 below shows an approximation of the system of forces acting on the human forearm. The weight of the forearm is 25N and acts 15cm from the elbow of a girl lifting a dumbbell of weight 50N

Find the
1)Force, F, exerted on the human forearm by the muscle in the upper arm
2)Forces acting at the point, E of the elbow
3)Tension if theta is 45 degrees

2. Relevant equations
sum of ACW = sum of CW
sum of upward forces = sum of downward forces

3. The attempt at a solution

My Attempt is in the pictures below

Attached Images
File Type: jpg img1.jpg (36.4 KB)
File Type: jpg img2.jpg (41.4 KB)
File Type: jpg img3.jpg (16.8 KB)

http://ift.tt/1iurcmp

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