Optimization Problem with Cylinder

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SUMMARY

The optimization problem involves determining the height of a cylindrical tin can with a fixed volume of 16π cubic inches while minimizing the surface area. The volume formula V = πr²h relates the radius r and height h. To minimize surface area, one must express the surface area as a function of height alone, leveraging the relationship between r and h derived from the volume constraint. The solution requires applying calculus to find the minimum value of this function.

PREREQUISITES
  • Understanding of calculus, specifically optimization techniques
  • Familiarity with the volume formula for cylinders (V = πr²h)
  • Knowledge of surface area calculation for cylinders
  • Ability to manipulate algebraic expressions to isolate variables
NEXT STEPS
  • Learn how to derive the surface area formula for a cylinder (A = 2πrh + 2πr²)
  • Study methods for finding critical points of functions using derivatives
  • Explore applications of the second derivative test for optimization
  • Investigate real-world applications of optimization in engineering and design
USEFUL FOR

Students studying calculus, particularly those focusing on optimization problems, as well as engineers and designers interested in material minimization for cylindrical structures.

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Homework Statement



The volume of a cylindrical tin can with a top and a bottom is to be 16\pi cubic inches. If a minimum amount of tin is to be used to construct the can, what must be the height, in inches, of the can?


Homework Equations



V=\pir2h

The Attempt at a Solution


So I first tried solving for r in termsof h, but from there I am not sure how I am suppose to do this problem. Could someone please help me?
 
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You are trying to minimize the surface area of the can. What is the surface area of a cylinder of radius r and height h?

You are told that no matter what h and r are, you must always have V=16 \pi, hence the radius r is dependent on what the height h is. For a given h, what should the radius of the can be?

You should then be able to come up with an expression for the surface area of the can as a function of height only. How can you find the minimum value of a function?
 

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