(a) What force should the woman in Figure 9.43 exert on the floor with each hand to do a push-up? Assume that she moves up at a constant speed.

(b) The triceps muscle at the back of her upper arm has an effective lever arm of 1.75 cm, and she exerts force on the floor at a horizontal distance of 20.0 cm from the elbow joint. Calculate the magnitude of the force in each triceps muscle, and compare it to her weight.

(c) How much work does she do if her center of mass rises 0.240 m?

(d) What is her useful power output if she does 25 pushups in one minute?

Transcribed Image Text:

Fp 0.90 m m = 50.0 kg CG 1.50 m W Freaction