Equilibrium: An athlete holds a 7.5-kg shot put in his hand with his lower arm horizontal, as shown in the figure. His lower arm has a mass of 2.8 kg and its center of gravity (or center of mass) is 12 cm from the elbow-joint pivot. How much force must the extensor muscle (which is
M in the figure) in the upper arm exert on the lower arm?
A. 100 N
B. 500 N
C. 1000 N
D. 1500 N
Answer: C
Physics & Space Science
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