Question

To strengthen his arm and chest muscles, an 87 kg athlete 2.0 m tall is doing a series of push-ups as shown in the figure below (Figure 1). His center of mass is 1.20 m from the bottom of his feet, and the centers of his palms are 30.0 cm from the top of his head.

Part A

Find the force that the floor exerts on each of his feet, assuming that both feet exert the same force.

Part B

Find the force that the floor exerts on each of his hand, both palms exert the same force.

Answer 1

2N Feet 2 FM O.3m .2 m 6 m = 81x9.8c 852.6 N 2 Feet + 2 FH 852.6 Feet +FH 426-3 N Moment ba lqnce qbout P 1 X2x Fu- 852.5x12 FH= 300.92. N 12SN FFeet = Frand301 N