Surface Area of Revolution about x axis

In summary, the conversation discusses a surface area problem involving a function and its split into two parts. The attempted solution involves finding the range and using a formula to integrate, but the conversation suggests a different approach.
  • #1
mikbear
5
0

Homework Statement


x^2 + (y - 2)^2 = 1
The hint given by the question was to split the function into 2

Homework Equations


Surface Area about x axis

The Attempt at a Solution


So i did this.
(y - 2)^2 = 1 - x^2
y = √(1 - x^2) +2 and y = 2 - √(1 - x^2)

The range I calculated
when y= 0; x = - √(-3) and x = √(-3)

I use the formula ∫ 2∏ * (√(1-x^2) + 2)√(1 + x^2/(1 - x^2))dx

Then i got stuck as it became messy
 
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  • #2
mikbear said:
when y= 0; x = - √(-3) and x = √(-3)
That just means that y=0 does not happen. Your integration limits are determined by something else...
I use the formula ∫ 2∏ * (√(1-x^2) + 2)√(1 + x^2/(1 - x^2))dx
How did you get that formula?
 
  • #3
mikbear said:

Homework Statement


x^2 + (y - 2)^2 = 1
The hint given by the question was to split the function into 2


Homework Equations


Surface Area about x axis


The Attempt at a Solution


So i did this.
(y - 2)^2 = 1 - x^2
y = √(1 - x^2) +2 and y = 2 - √(1 - x^2)

The range I calculated
when y= 0; x = - √(-3) and x = √(-3)

I use the formula ∫ 2∏ * (√(1-x^2) + 2)√(1 + x^2/(1 - x^2))dx

Then i got stuck as it became messy

The first step would be to identify the curve that is being rotated. Have you drawn its graph? Do you see why you would want to use the hint?
 

Related to Surface Area of Revolution about x axis

1. What is the definition of surface area about x axis?

Surface area about x axis refers to the total area of a three-dimensional object when rotated around the x axis. This measurement helps to determine the amount of material needed to cover the surface of the object.

2. How is surface area about x axis calculated?

The formula for calculating surface area about x axis is 2π∫(f(x)√(1+(f'(x))^2)dx, where f(x) represents the function of the object's cross-section in terms of x. This integral can be solved using calculus.

3. What is the significance of surface area about x axis in real-life applications?

Surface area about x axis is an important measurement in fields such as engineering, architecture, and manufacturing. It helps in determining the amount of material needed to construct an object, as well as in optimizing designs for efficiency and cost-effectiveness.

4. How does surface area about x axis differ from surface area about y and z axes?

Surface area about x axis is specific to the rotation of an object around the x axis, while surface area about y and z axes refer to rotations around the y and z axes, respectively. This means that the cross-sections of the object and the formula for calculating surface area will be different for each axis.

5. Can surface area about x axis be negative?

No, surface area about x axis cannot be negative. It is always a positive value since it represents the total area of the object's surface, regardless of its orientation.

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