Question

To strengthen his arm and chest muscles, an 83.0 kg athlete 2.00 m tall is doing a series of push-ups. His center of mass is 1.15 m from the bottom of his feet, and the centers of his palms are 30.0 cm from the top of his head. Find the force that the floor exerts on each of his feet and on each hand, assuming that both feet exert the same force and both palms do likewise.

Answer 1

Draw the figure.

sum moments about thefeet.

83g*1.15=2*palm(2-.3)

That gives you each palm force. Now, 2*Palm+ 2*feet= 83g
solve for the force on each foot.

Answer 2

2.7