Question 3: An unknown amount of vertical shear force (not shown in the figure) is applied to the following cross-section. Transverse stress value is desired at distance 'y' away from the horizontal neutral axis, as shown in the figure below. In the process of calculating the first moment of area, Q, two different approaches are adopted: 1) Area A' is considered above the point of interest, and 2) Area A' is considered below the point of interest. Which of the following statements is correct? Area= A' (NA) (NA) Area= A' %3D %3D

Mechanics of Materials (MindTap Course List)
9th Edition
ISBN:9781337093347
Author:Barry J. Goodno, James M. Gere
Publisher:Barry J. Goodno, James M. Gere
Chapter7: Analysis Of Stress And Strain
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Please help. This problem involves moment of inertia on a cross-section. Thank you.

Question 3: An unknown amount of vertical shear force (not shown in the figure) is applied to
the following cross-section. Transverse stress value is desired at distance 'y' away from the
horizontal neutral axis, as shown in the figure below. In the process of calculating the first
moment of area, Q, two different approaches are adopted: 1) Area A' is considered above the
point of interest, and 2) Area A' is considered below the point of interest. Which of the following
statements is correct?
-Area= A'
(NA)
-Area= A'
Q, = A'g'
Qq= A'g
%3D
1: Distamce between NA and
the Centroidal axis of A'
a) Q1 > Q2
b) Q1 = Q2
c) Q1 < Q2
d) The answer depends on the value of y
Transcribed Image Text:Question 3: An unknown amount of vertical shear force (not shown in the figure) is applied to the following cross-section. Transverse stress value is desired at distance 'y' away from the horizontal neutral axis, as shown in the figure below. In the process of calculating the first moment of area, Q, two different approaches are adopted: 1) Area A' is considered above the point of interest, and 2) Area A' is considered below the point of interest. Which of the following statements is correct? -Area= A' (NA) -Area= A' Q, = A'g' Qq= A'g %3D 1: Distamce between NA and the Centroidal axis of A' a) Q1 > Q2 b) Q1 = Q2 c) Q1 < Q2 d) The answer depends on the value of y
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