College Physics
College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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One first class lever system involves the extensor
muscle,
which exerts a force M to hold the head erect:
CG
the force W of the weight of the head, located at its
center of gravity, lies forward of the force F exerted by
the first cervical vertebra. the head has a mass of about
4 kg or is about 40N.
a. Find F and M.
b.If the area of the first cervical vertebra, which the
head rests on is 5 cm?, find the stress on it .
3 cm 5 cm
stress = force/ area
stress = F/A (N/m2)
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Transcribed Image Text:Example One first class lever system involves the extensor muscle, which exerts a force M to hold the head erect: CG the force W of the weight of the head, located at its center of gravity, lies forward of the force F exerted by the first cervical vertebra. the head has a mass of about 4 kg or is about 40N. a. Find F and M. b.If the area of the first cervical vertebra, which the head rests on is 5 cm?, find the stress on it . 3 cm 5 cm stress = force/ area stress = F/A (N/m2) Eivate Wipws Go to Settinos to activate Windows
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