Find Force M Exerted by Muscle in Test Apparatus

[mikefitz]

A person exerts a horizontal force |F| = 192 N in the test apparatus shown in the drawing. Find the horizontal force M (magnitude and direction) that is flexor muscle exerts on his forearm. (L = 0.31 m, h = 0.047 m)

http://img238.imageshack.us/img238/1465/c9p17iy6.jpg

I know that the torque for the .31m length is equal to 59.52 Nm; how do I begin to solve the force M for the second length of .047m?

 

[FredGarvin]

The sum of the moments about the elbow joint must = 0.

 

[mikefitz]

does this mean I can calculate the torque for both points and add them in an equation and set them equal to 0?