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Single Variable Calculus: Early Tr...

8th Edition
James Stewart
ISBN: 9781305270336

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BuyFindarrow_forward

Single Variable Calculus: Early Tr...

8th Edition
James Stewart
ISBN: 9781305270336
Textbook Problem

Calculate the moments Mx and My and the center of mass of a lamina with the given density and shape.

34. ρ = 4

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To determine

To find: The moments Mx, My and the center of mass of a lamina with the given density and shape.

Explanation

Given:

The density is ρ=4

Calculation:

Calculate the area of given shape:

A=12bh (1)

Substitute 2 for b and 3 for h in Equation (1).

A=12×2×3=3

Calculate the mass of given shape:

m=ρA (2)

Substitute 4 for ρ and 3 for A in Equation (2).

m=4×3=12

Consider y=32x+3

Calculate the moment Mx of a lamina with the given density and shape:

Mx=ρab12y2dx (3)

Substitute 0 for a, 2 for b, 4 for ρ, and (32x+3) for y in Equation (3).

Mx=40212(32x+3)2dx=4×1202(94x29x+9)dx=2×902(x24x+1)dx=1802(x24x+1)dx (4)

Integrate Equation (4).

Mx=18[x2+14(2+1)x1+11+1+x]02=18[x312x22+x]02=18{[(2)312(2)22+(2)][(0)312(0)22+(0)]}

=18(462+2)0=12

Hence, the moment Mx of a lamina with the given density and shape is 12.

Calculate the moment My of a lamina with the given density and shape:

My=ρabxydx (5)

Substitute 0 for a, 2 for b, 4 for ρ, and (32x+3) for y in Equation (5)

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