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 $\overrightarrow { \mathrm { F } } _ { \mathrm { M } }$ in the figure) in the upper arm exert on the lower arm?

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

Question

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  $\overrightarrow { \mathrm { F } } _ { \mathrm { M } }$  in the figure) in the upper arm exert on the lower arm?

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

Quizplus · Accepted Answer

The Answer of 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  $\overrightarrow { \mathrm { F } } _ { \mathrm { M } }$  in the figure) in the upper arm exert on the lower arm?

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

An Athlete Holds a 7 F→M\overrightarrow { \mathrm { F } } _ { \mathrm { M } }FM​

An Athlete Holds a 7 $\overrightarrow { \mathrm { F } } _ { \mathrm { M } }$