Muscle Dynamics
Need Help With Rotational Dynamics Question?
The figure shows an outstretched arm (0.61 m in length) that is parallel to the floor. The arm is pulling downward against the ring attached to the pulley system, in order to hold the 98-N weight stationary. To pull the arm downward, the latissimus dorsi muscle applies the force M in the figure, at a point that is 0.069 m from the shoulder joint and oriented at an angle of 29°. The arm has a weight of 47 N and a center of gravity (cg) that is located 0.28 m from the shoulder joint. Find the magnitude of M.
http://edugen.wiley.com/edugen/courses/crs1507/art/images/cutnell3158c09/image_t/ngr034.gif
Balance of moments of forces at shoulder joint axis:
98*0.61 = M*sin (29)*0.069 + 47*0.28
M = 1394 N
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