An Olympic lifter (m =103kg) is holding a lift with a mass of 350 kg. The bar exerts a purely vertical force that is equally distributed between both hands. Each arm has a mass of 9 kg, are 0.8m long and form a 40\deg angle with the horizontal. The CoM for each arm is 0.5 m from hand. Assuming the lifter is facing us in the diagram below, his right deltoid inserts 14cm from the shoulder at an angle of 13\deg counter-clockwise from the humerus.

a) You are interested in calculating the force in the right deltoid. Draw a free body diagram of the right arm including the external forces, joint reaction forces, a coordinate system and state your assumptions. [5 Marks] 

b) Find the force right deltoid [5 Marks]