Problem 1. Consider an 80-kg man assuming a position as shown in the figure below. The weight of the torso (W) is 60% of the total weight of the man while the weight of the head and arms is 50% of the weight of the torso. The spine makes an angle of 55° with respect to the vertical axis while the erector spinalis muscle makes an angle of 12° with respect to the spine. W, acts at point B while W, acts at point E which is midway between points B and A. The force exerted by the erector spinalis muscle acts at a point D such that segment AD is about 75% the length of the segment AB.

Problem 1. Consider an 80-kg man assuming a position as shown in the figure below. The weight of the torso (W) is 60% of the total weight of the man while the weight of the head and arms is 50% of the weight of the torso. The spine makes an angle of 55° with respect to the vertical axis while the erector spinalis muscle makes an angle of 12° with respect to the spine. W, acts at point B while W, acts at point E which is midway between points B and A. The force exerted by the erector spinalis muscle acts at a point D such that segment AD is about 75% the length of the segment AB.

Mechanics of Materials (MindTap Course List)

9th Edition

ISBN:9781337093347

Author:Barry J. Goodno, James M. Gere

Publisher:Barry J. Goodno, James M. Gere

Chapter5: Stresses In Beams (basic Topics)

Section: Chapter Questions

Problem 5.12.11P: A cylindrical brick chimney of height H weighs w = 825 lb/ft of height (see figure). The inner and...

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