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Calculus: Early Transcendentals

8th Edition
James Stewart
ISBN: 9781285741550

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Calculus: Early Transcendentals

8th Edition
James Stewart
ISBN: 9781285741550
Textbook Problem

Use cylindrical coordinates.

22. Find the volume of the solid that lies within both the cylinder x2 + y2 = 1 and the sphere x2 + y2 + z2 = 4.

To determine

To find: The volume of the given solid by using cylindrical coordinates.

Explanation

Given:

The region E lies within both the cylinder x2+y2=1 above the sphere x2+y2+z2=4 .

Formula used:

If f is a cylindrical region E given by h1(θ)rh2(θ),αθβ, u1(rcosθ,rsinθ)zu1(rcosθ,rsinθ) where 0βα2π , then,

Ef(x,y,z)dV=αβh1(θ)h2(θ)u1(rcosθ,rsinθ)u2(rcosθ,rsinθ)f(rcosθ,rsinθ,z)rdzdrdθ (1)

The cylindrical coordinates (r,θ,z) corresponding to the rectangular coordinates (x,y,z) is,

r=x2+y2θ=tan1(yx)z=z

Calculation:

From the given equations, the value of z is obtained below.

x2+y2+z2=4z2=4x2y2z=±4x2y2z=±4r2

It is observed that r varies from 0 to 1, and θ varies from 0 to 2π .

Use the formula mentioned above to change the given problem into cylindrical coordinates. Then, by the equation (1), the volume of the given solid is computed as follows.

Ef(x,y,z)dV=0102π4r24r2(r)dzdθdr=0102π4r24r2rdzdθdr

Integrate with respect to z and apply the limit of it.

0102π4r24r2rdzdθdr=0102πr[z]4r24r2dθdr=0102πr(4r2(4r2))dθdr=0102πr(4r2+4r2)dθdr=0102πr(24r2)dθdr

Integrate with respect to θ and apply the limit of it

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