Find the centroid of the region bounded by the graphs of y = xe (e is raised to the power -x/2 ) , y = 0 , x = 0 , x = 4

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
Question

Find the centroid of the region bounded by the graphs of y = xe (e is raised to the power -x/2 ) , y = 0 , x = 0 , x = 4

Expert Solution
Step 1 set up for centroid

The given equation is y=xe-x2, y=0, x=0, x=4.

Find the centroid of the region bounded by the graphs.

 

Using the formula of the centroid of a region bounded by the curves are:

The position of centroid of the area under the curves x=a, x=b, and y=fx and the x-axis is given by X¯,Y¯.

Where, 

X¯=abxydxabydxY¯=aby22dxabydx

Using some integral formulae and properties:

xndx=xn+1n+1+Cexdx=ex+Cadx=adxabcdx=cb-auvdx=uvdx-dudxvdxdx

Where, u and v are differentiable functions and xndx is valid for all real values of n except -1.

Using some differentiation formulae:

ddxxn=nxn-1ddxex=ex 

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