4. 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. 0.8m '' center of mass of arm 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. b) Find the force exerted by the right deltoid c) Find the shoulder joint contact force. Report your answer using the magnitude and direction of the shoulder force vector.

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Please help me on the following question (Please refer to image below)

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.

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.

B) Find the force exerted by the right deltoid

C) Find the shoulder joint contact force. Report your answer using the magnitude and direction
of the shoulder force vector.

4. 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.
0.8m
''
center of mass
of arm
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.
b) Find the force exerted by the right deltoid
c) Find the shoulder joint contact force. Report your answer using the magnitude and direction
of the shoulder force vector.
Transcribed Image Text:4. 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. 0.8m '' center of mass of arm 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. b) Find the force exerted by the right deltoid c) Find the shoulder joint contact force. Report your answer using the magnitude and direction of the shoulder force vector.
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