anonymous
  • anonymous
name the solid obtained by rotating the set of points (x,y) such that (x-4)^2 +y^2 < or =1 around the y-axis. (set up, but do not evaluate, an integral whose value is the volume of this solid. )
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
its kinda confusing to me :(
anonymous
  • anonymous
there is another way to do this I think. You look at the area of the circle, and multiply that by r*d(theta). That is your differential Volume element. Then you integrate from 0 to 2*Pi. It has the same result as watchmath's method. \[\int\limits_{0}^{2\pi}\pi*1^{2}*4d \theta\]

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anonymous
  • anonymous
where r is the radius to the center of the circle from the origin, and youre integraing about the y axis
watchmath
  • watchmath
So we can think of this \(rd\theta\) as the thickness of this differential volume?
anonymous
  • anonymous
i think so. it is the arclength of one small piece of the volume which would be the thickness of the differential element. Then adding these all up around the y axis gives the volume.
watchmath
  • watchmath
Jojo, are you familiar with the cyllindrical shell method?
anonymous
  • anonymous
watchmath is that method sort of a way to slice the circle into vertical strips and add up each shell over the diameter of the circle? It's been a while since I did these problems.
watchmath
  • watchmath
Yes, that's correct.
anonymous
  • anonymous
thank you guys! but please help me with other my review questions?? :(

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