College Physics
College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Problem 5: Consider the forces involved in doing push-ups. The woman's weight acts as a
force exerted downward on her center of gravity (marked CG in the figure). You may assume that the
angle between her body and the floor is small enough so that the small angle approximation is valid
throughout this motion.
m = 50 kg
CG
w
F
0.90 m
reaction
1.50 m
Part (a) Calculate the force, in newtons, the woman in the figure exerts to do a pushup at constant speed.
F =
sin()
cos()
tan()
7 8
9 HOME
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Transcribed Image Text:Problem 5: Consider the forces involved in doing push-ups. The woman's weight acts as a force exerted downward on her center of gravity (marked CG in the figure). You may assume that the angle between her body and the floor is small enough so that the small angle approximation is valid throughout this motion. m = 50 kg CG w F 0.90 m reaction 1.50 m Part (a) Calculate the force, in newtons, the woman in the figure exerts to do a pushup at constant speed. F = sin() cos() tan() 7 8 9 HOME
Part (b) How much work, in joules, does she do if her center of mass rises 0.23 m?
Part (c) What is her useful power output, in watts, if she does 27 push-ups in 1 min? Ignore any work done during the downward motion.
P =
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Transcribed Image Text:Part (b) How much work, in joules, does she do if her center of mass rises 0.23 m? Part (c) What is her useful power output, in watts, if she does 27 push-ups in 1 min? Ignore any work done during the downward motion. P =
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