Consider the following figure. (a) What force in newtons should the woman in the figure exert on the floor with each hand to do a push-up? Assume that she moves up at a constant speed. N (b) The triceps muscle at the back of her upper arm has an effective lever arm of 1.76 cm, and she exerts force on the floor at a horizontal distance of 19.6 cm from the elbow joint. Calculate the magnitude of the force in newtons in each triceps muscle. N Compare the magnitude of the total force exerted by both triceps muscles to her weight. total force exerted by both triceps muscles her weight = (c) How much work does she do in joules if her center of mass rises 0.230 m? J

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Chapter1: Units, Trigonometry. And Vectors
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Consider the following figure.

(a)
What force in newtons should the woman in the figure exert on the floor with each hand to do a push-up? Assume that she moves up at a constant speed.
N
(b)
The triceps muscle at the back of her upper arm has an effective lever arm of 1.76 cm, and she exerts force on the floor at a horizontal distance of 19.6 cm from the elbow joint. Calculate the magnitude of the force in newtons in each triceps muscle.
N
Compare the magnitude of the total force exerted by both triceps muscles to her weight.
total force exerted by both triceps muscles
her weight
 =
(c)
How much work does she do in joules if her center of mass rises 0.230 m?
J
(d)
What is her useful power output in watts if she does 26 push-ups in one minute?
W
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