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The Length of a Curve

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Using the curve y=2x^(3/2) +3 (3/2 is the power on x) from x=0 to x=4 :
A.) estimate the length of the curve by computing the straight line distance between the endpoints.
*I found the answer to be sq root of 272 or approx. 16.4924. Sound correct?

B.) Compute exact length of the curve.
*I'm using S = The Integral from 0 to 4 sq root of 1 +(3x^1/2)^2 dx, but I get a huge number - what am I doing wrong?

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Solution Summary

The length of a curve is calculated using an integral. The exact length of the curve is computed.

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Using the curve y=2x^(3/2) +3 (3/2 is the power on x) from x=0 to x=4 :
A.) ...

Solution provided by:
Changping Wang, MA
Education
  • BSc , Wuhan Univ. China
  • MA, Shandong Univ.
Recent Feedback
  • "Your solution, looks excellent. I recognize things from previous chapters. I have seen the standard deviation formula you used to get 5.154. I do understand the Central Limit Theorem needs the sample size (n) to be greater than 30, we have 100. I do understand the sample mean(s) of the population will follow a normal distribution, and that CLT states the sample mean of population is the population (mean), we have 143.74. But when and WHY do we use the standard deviation formula where you got 5.154. WHEN & Why use standard deviation of the sample mean. I don't understand, why don't we simply use the "100" I understand that standard deviation is the square root of variance. I do understand that the variance is the square of the differences of each sample data value minus the mean. But somehow, why not use 100, why use standard deviation of sample mean? Please help explain."
  • "excellent work"
  • "Thank you so much for all of your help!!! I will be posting another assignment. Please let me know (once posted), if the credits I'm offering is enough or you ! Thanks again!"
  • "Thank you"
  • "Thank you very much for your valuable time and assistance!"
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