In the Figure,the Horizontal Lower Arm Has a Mass of 2.8

question 25

Multiple Choice

In the figure,the horizontal lower arm has a mass of 2.8 kg and its center of gravity is 12 cm from the elbow joint pivot.How much force F_M must the vertical extensor muscle in the upper arm exert on the lower arm to hold a 7.5 kg shot put?

• A)100 N
• B)500 N
• C)750 N
• D)1000 N
• E)1500 N

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