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
_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

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