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An Athlete Holds a 7

Question 39

Multiple Choice

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 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 <sub>M</sub> in the figure) in the upper arm exert on the lower arm? A) 100 N B) 500 N C) 1000 N D) 1500 N
M in the figure) in the upper arm exert on the lower arm? 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 <sub>M</sub> in the figure) in the upper arm exert on the lower arm? A) 100 N B) 500 N C) 1000 N D) 1500 N


A) 100 N
B) 500 N
C) 1000 N
D) 1500 N

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