Volume of Solid (Washer Method)

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Homework Help Overview

The discussion revolves around finding the volume of a solid formed by rotating the area bounded by the curves \(y = x^{1/3}\) and \(x = 4y\) about the x-axis. Participants are exploring the application of the washer method in this context.

Discussion Character

  • Exploratory, Assumption checking, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the setup of the problem, including the limits of integration and the regions involved in the rotation. There is a focus on whether the region of interest is limited to the first quadrant and how this affects the volume calculation.

Discussion Status

The conversation is ongoing, with participants questioning the original poster's approach and suggesting that there may be an oversight regarding the quadrants involved in the problem. Guidance has been offered to clarify the integration process and the assumptions made about the region being rotated.

Contextual Notes

There is a mention of potential confusion regarding the intersection points and whether the volume calculation should account for the entire region or just a specific quadrant. The original poster's answer appears to be influenced by this ambiguity.

dan38
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Homework Statement


Question is:
FInd the volume for area bound between
y = x ^ (1/3)
x = 4y
About the x -axis

I found the volumes from 0 to 8 using the washer method and then multiplied that by 2 since they intersect at y = 0, -2 and 2 x = 0, 8 and -8
Is that wrong?
Cause my answer was double what it should have been..


Homework Equations





The Attempt at a Solution

 
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dan38 said:

Homework Statement


Question is:
FInd the volume for area bound between
y = x ^ (1/3)
x = 4y
About the x -axis

I found the volumes from 0 to 8 using the washer method and then multiplied that by 2 since they intersect at y = 0, -2 and 2 x = 0, 8 and -8
Is that wrong?
Cause my answer was double what it should have been..
What does your integral look like?
 
In integrated the expression:

x^(2/3) - ( x^2/16)
 
Is there something in the problem that you have overlooked? For example is the region that is rotated around the x-axis supposed to be only in the first quadrant? If so, then when you doubled your answer to account for the part of the region in the third quadrant, that would cause your answer to be too large by a factor of two.

Also, can you show the work you did in integrating?
 

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