What Is the Vertical Force at the Elbow Joint?

[annanause]

Homework Statement

State an expression for the vertical force at the elbow joint F_E in terms of the other forces acting when the arm is held horizontal with the dumbbell in the hand.

Homework Equations

No equations needed.

The Attempt at a Solution

Since muscles can not expand beyond their resting length, joints and muscles often exert forces that act in opposite directions and thus subtract.

Am I even close to what I was asked to answer?

 

[haruspex]

Am I even close to what I was asked to answer?

No, the question is asking for an equation relating the forces. It's not entirely clear, but I think it just wants one relating to the sum of the vertical forces; looks like moments get considered later in the question.