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Desperately Need Help!

 
 
Reply Mon 30 Sep, 2013 08:12 am
Compute the surface area generated by revolving the curve f(x)=2√x, 1<= x <=4, about the x axis. Need detailed solution!
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Type: Question • Score: 0 • Views: 965 • Replies: 5
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fresco
 
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Reply Mon 30 Sep, 2013 11:04 am
@ameliajean,
http://mathworld.wolfram.com/SurfaceofRevolution.html
ameliajean
 
  1  
Reply Mon 30 Sep, 2013 12:19 pm
@fresco,
Thank you, though I am aware of the technique. I am having trouble evaluating the integral sqrt(1 +1/x). I need to know how to evaluate this integral to solve surface area of rotation.
Kolyo
 
  1  
Reply Mon 30 Sep, 2013 03:21 pm
@ameliajean,
Read the formula at fresco's link again.

Your integrand seems to be missing a factor of 2π*y.
ameliajean
 
  1  
Reply Mon 30 Sep, 2013 07:34 pm
@Kolyo,
You seem to be misunderstanding the difficult part of the problem. The 2pi is not the problem. Constants get pulled out. I need help evaluating remaining integral. I need help with finding the appropriate integration technique for sqrt(1+(1/x))
Kolyo
 
  1  
Reply Mon 30 Sep, 2013 08:15 pm
@ameliajean,
ameliajean wrote:

Constants get pulled out.


y isn't a constant.
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