Torque of human arm when bending

[mdp_somebodeh]

To find the respective torque that is need to bend the the arm at 180 degrees, 90 degrees and 30 degrees. The arm is not holding anything.

Relevant equations and information
τ=rFsinθ

total arm weight =3.35kg
upper arm length =19cm
forearm length =28cm

 

[tiny-tim]

welcome to pf!

hi mdp_somebodeh! welcome to pf!

show us what you've tried, and where you're stuck, and then we'll know how to help!

(start with 180°)

 

[haruspex]

This is bending at the elbow, right? Don't you need to know the orientation of the upper arm?

 

[mdp_somebodeh]

Im sorry for the late reply.
This is what i have done so far but i doubt it is correct
http://s7.postimg.org/smklfe5ob/IMG_20130607_WA0003.jpg
these are the relevant equations
http://s17.postimg.org/7iorc64pr/IMG_20130613_WA0001.jpg

 

[tiny-tim]

sorry, too difficult to read

can you type it out, please? ​