Determine the second moment of area for the shaded region shown in Fig. with respect to The x-axis. y= 2bx 2b

International Edition---engineering Mechanics: Statics, 4th Edition
4th Edition
ISBN:9781305501607
Author:Andrew Pytel And Jaan Kiusalaas
Publisher:Andrew Pytel And Jaan Kiusalaas
Chapter8: Centroids And Distributed Loads
Section: Chapter Questions
Problem 8.36P: Determine the centroidal coordinates of the plane region by numerical integration.
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Determine the second moment of area for the
shaded region shown in Fig.
with respect to
The x-axis.
y= 2bx
2b
Transcribed Image Text:Determine the second moment of area for the shaded region shown in Fig. with respect to The x-axis. y= 2bx 2b
Expert Solution
Step 1

Consider the region under the parabola y2=2bx as area (1) and consider a strip of thickness dy at a distance of from the x-axis as shown in the below figure.

Mechanical Engineering homework question answer, step 1, image 1

The expression for the area of strip is given by;

dA=2b-xdy

Eliminate x from the equation of the parabola y2=2bx.

y2=2bxx=y22b

The expression for the second moment of the area below the parabola about x-axis is given by;

Ix1=02by2dA

Substitute all the values in the above equation.

Ix1=02by22b-xdy=02by22b-y22bdy=02b2by2-y42bdy=2by33-y510b02b=2b2b33-2b510b=16b43-16b45=32b415

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