Question

solve question number 7 and 8

R. RD wt dwt Figure 6.1 7. Which of the three segments in Problem 6 creates the largest torque about the shoulder when the arm is horizontally extended? Explain your answer and discuss the implications for positioning the arm for shoulder-level tasks. Describe the common injuries of shoulder below: 8. a) Dislocation b) Rotator cuff damage c) Rotational damage

Answer 1

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(7) From the three segments, weight ot largest torque since it is acting at the arm 'wt' creates the about the shoulder a greater distance from the shoulder dot' The torque is given by, 4p X 70L Other forces are actina at shoulder itself. the tovque created by them is zero Tbis torque T' produces shear stress at the Hence shoulder joint given by, T T Chere r= radius of bone J J= Polar moment of inertia of bone shear stress 'T exceeds the máximum strength of buman bone about When this 51.6 MPa, the bone cracks