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92.131 Calculus 1 Optimization Problems

Calculus 1 Optimization Problems 1) A Norman window has the outline of a semicircle on top of a rectangle as shown in the figure. Suppose there is +8 feet of wood trim available for all 4 sides of the rectangle and the semicircle. Find the dimensions of the rectangle (and hence the semicircle) that will maximize the area of the window. 2) You are building a cylindrical barrel in which to put Dr. Brent so you can float him over Niagara Falls. I can fit in a barrel with volume equal 1 cubic meter. The material for the lateral surface costs $18 per square meter.

92.131 Calculus 1 Optimization Problems Solutions: 1) We will assume both x and y are positive, else we do not have the required window. x y 2x Let P be the wood trim, then the total amount is the perimeter of the rectangle 4x+2y plus half the circumference of a circle of radius x, or πx. Hence the constraint is P =4x +2y +πx =8+π The objective function is the area

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  Area, Circumference, Perimeter

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