4. [15 marks] 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 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 counter-clockwise from the humerus. center of mass of arm a) You are interested in calculating the force in the right deltoid. Draw a free body diagram Fihe richt arm including the external forces, joint reaction forces, a coordinate system and b) Find the force right deltoid [S Marks] ' ' i irection ) Find the shoulder joint contact force. Report your answer using the magnitude and dire of the shoulder force vector. [5 Marks] .--_