Calculate the force (in N) the woman in the figure below exerts to do a push-up at a constant speed, taking all data to be known to three digits.

Glencoe Physics: Principles and Problems, Student Edition
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ISBN:9780078807213
Author:Paul W. Zitzewitz
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Chapter8: Rotational Motion
Section: Chapter Questions
Problem 75A
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Calculate the force (in N) the woman in the figure below exerts to do a push-up at a constant speed, taking all data to be known to three digits. 
(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
later chapter.)
275.733
0.88 m
N
m = 47 kg
CG
1.47 m
W
Freaction
(b) How much work (in J) does she do if her center of mass rises 0.200 m?
92.12
J
(c) What is her useful power output (in W) if she does 30 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.)
92.12
X W
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 later chapter.) 275.733 0.88 m N m = 47 kg CG 1.47 m W Freaction (b) How much work (in J) does she do if her center of mass rises 0.200 m? 92.12 J (c) What is her useful power output (in W) if she does 30 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.) 92.12 X W
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