(a) Calculate the force (in N) the woman in the figure below exerts to do a push-up at constant speed, taking all data to be known to three digits. (You may need to use torque methods from a later chapter. m = 62 kg CG w Freaction 0.87 m 1.45 m (b) How much work (in J) does she do if her center of mass rises 0.180 m? (c) What is her useful power output (in W) if she does 27 push-ups in 1 min? (Should work done lowering her body be included? See the discussion of useful work in Work, Energy, and Power in Humans.) w
(a) Calculate the force (in N) the woman in the figure below exerts to do a push-up at constant speed, taking all data to be known to three digits. (You may need to use torque methods from a later chapter. m = 62 kg CG w Freaction 0.87 m 1.45 m (b) How much work (in J) does she do if her center of mass rises 0.180 m? (c) What is her useful power output (in W) if she does 27 push-ups in 1 min? (Should work done lowering her body be included? See the discussion of useful work in Work, Energy, and Power in Humans.) w
College Physics
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Chapter1: Units, Trigonometry. And Vectors
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Transcribed Image Text:(a) Calculate the force (in N) the woman in the figure below exerts to do a push-up at constant speed, taking all data to be known to three digits. (You may need to use torque methods from a later chapter.)
m = 62 kg
CG
w
Freaction
0.87 m
1.45 m
N
(b) How much work (in J) does she do if her center of mass rises 0.180 m?
(c) What is her useful power output (in Ww) if she does 27 push-ups in 1 min? (Should work done lowering her body be included? See the discussion of useful work in Work, Energy, and Power in Humans.)
Expert Solution
Step 1
Given data:
- The mass is m=62 kg
- The rise distance of the center of mass is d=0.180 m
- The number of push-ups in t=60 sec is n=27
Part a:
The following figure shows the free-body diagram:
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