The lumbar portion of the human spine supports the entire weight of the upper torso and the force load imposed on it. We consider here the disk (shaded red) between the lowest vertebra of the lumbar region (L) and the uppermost vertebra of the sacrum re- gion. (a) For the case L = 0, determine the com- pressive force C and the shear force S supported by this disk in terms of the body weight W. The weight W, of the upper torso (above the disk in question) is 68% of the total body weight W and acts at G1. The vertical force F which the rectus muscles of the back exert on the upper torso acts as shown in the figure. (b) Repeat for the case when the person holds a weight of magnitude L = W/3 as shown. State any assumptions.

The lumbar portion of the human spine supports the entire weight of the upper torso and the force load imposed on it. We consider here the disk (shaded red) between the lowest vertebra of the lumbar region (L) and the uppermost vertebra of the sacrum re- gion. (a) For the case L = 0, determine the com- pressive force C and the shear force S supported by this disk in terms of the body weight W. The weight W, of the upper torso (above the disk in question) is 68% of the total body weight W and acts at G1. The vertical force F which the rectus muscles of the back exert on the upper torso acts as shown in the figure. (b) Repeat for the case when the person holds a weight of magnitude L = W/3 as shown. State any assumptions.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Slope and Deflection

The slope in a deflected beam is described as an angle in radians made by the tangent of the section with the original axis of the beam. The deflection at any point on the axis of the beam is defined as the lateral displacement of the point before and after loading.

Question

The lumbar portion of the human spine supports the
entire weight of the upper torso and the force load
imposed on it. We consider here the disk (shaded red)
between the lowest vertebra of the lumbar region
(L5) and the uppermost vertebra of the sacrum re-
gion. (a) For the case L = 0, determine the com-
pressive force C and the shear force S supported by
this disk in terms of the body weight W. The weight
W. of the upper torso (above the disk in question) is
68% of the total body weight W and acts at Gj. The
vertical force F which the rectus muscles of the back
25 mm
L3
L4
L5
G2
4r
exert on the upper torso acts as shown in the figure.
(b) Repeat for the case when the person holds a
weight of magnitude L
assumptions.
W/3 as shown. State any
Sacrum
%3D
300 mm
50 mm
3王

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