**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

http://ift.tt/1iurcmp