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4. (35pts) A person is pulling a weight as shown below. His shoulder joint is not moving, but his elbow joint is free to rotate. The force vector makes an angle a with the vertical line, as shown below. L1 = 40cm L2 = 30cm F=20N α = 30° L1 し2 a) (10pts) Find the moment at elbow (ME) produced by F as a function of 9 (b) ( 10pts) Find the forearm angle θ that minimize the magnitude of the elbow moment. tc) (15pts) Find the forearm angle θ that maximize the magnitude of the elbow moment.
engineering   Mechanical-Engineering   
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