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Push-ups. To strengthen his arm and chest muscles, an

University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman ISBN: 9780321675460 31

Solution for problem 15E Chapter 11

University Physics | 13th Edition

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University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman

University Physics | 13th Edition

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Problem 15E

Push-ups. To strengthen his arm and chest muscles, an 82-kg athlete who is 2.0 m tall is doing push-ups as shown in below Fig. His center of mass is 1.15 m from the bottom of his feet, and the centers of his palms are 30.0 cm from the top of his head. Find the force that the floor exerts on each of his feet and on each hand, assuming that both feet exert the same force and both palms do likewise. Begin with a free-body diagram of the athlete. Figure:

Step-by-Step Solution:

Solution 15E Step 1: From diagram AD = the length of the athlete B = the centre of mass point CD =the length from arms to head BC = the length from centre of mass to the arms. Step 2: The force exerted by the floor to the arms = 2R x Moment on the point C 2 R (x.7) - mg( 1.15 ) = 0 2 R ( 1.7) = mg( 1.15 ) x 2 R = mg( 1.15 ) x 1.7 mg( 1.15 ) Rx 1.7×2 Mass of the athlete, m =81kg Rx 81 ×9.8 ×1.15 =268.49 1.7×2 The force exerted by the earth on a single arm R = 268.49N x

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Chapter 11, Problem 15E is Solved
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Textbook: University Physics
Edition: 13
Author: Hugh D. Young, Roger A. Freedman
ISBN: 9780321675460

The answer to “Push-ups. To strengthen his arm and chest muscles, an 82-kg athlete who is 2.0 m tall is doing push-ups as shown in below Fig. His center of mass is 1.15 m from the bottom of his feet, and the centers of his palms are 30.0 cm from the top of his head. Find the force that the floor exerts on each of his feet and on each hand, assuming that both feet exert the same force and both palms do likewise. Begin with a free-body diagram of the athlete. Figure:” is broken down into a number of easy to follow steps, and 90 words. This textbook survival guide was created for the textbook: University Physics, edition: 13. The full step-by-step solution to problem: 15E from chapter: 11 was answered by , our top Physics solution expert on 05/06/17, 06:07PM. Since the solution to 15E from 11 chapter was answered, more than 320 students have viewed the full step-by-step answer. University Physics was written by and is associated to the ISBN: 9780321675460. This full solution covers the following key subjects: feet, palms, athlete, Push, Force. This expansive textbook survival guide covers 26 chapters, and 2929 solutions.

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