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 FM must the vertical extensor muscle in the upper arm exert on the lower arm to hold a 7.5 kg shot put? 
Definitions:
Food Deprivation
A condition where an individual or organism does not consume enough food to meet basic nutritional requirements.
Basal Metabolic
The speed at which the body expends energy to sustain essential activities like breathing and temperature regulation when it is at rest.
Drive-reduction
A theory in psychology that explains motivation as being the result of drives, such as hunger or thirst, that an organism seeks to reduce to maintain homeostasis.
Arousal Theory
A theory of motivation that posits individuals seek to maintain an optimal level of arousal, not too high or too low.
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