Posted by Jeff on Saturday, July 30, 2011 at 11:08am.
7. A cardboard box manufacturer wishes to make open boxes from rectangular pieces of cardboard with dimensions 40 cm by 60 cm by cutting equal squares from the four corners and turning up the sides. Find the length of the side of the cutout square so that the box has the largest possible volume. Also, find the volume of the box.

calculus  Reiny, Saturday, July 30, 2011 at 12:28pm
let each side of the cutouts be x cm
So the base is 602x by 402x and the height is x
Volume = x(602x)(402x)
= 4x^3  200x^2 + 2400x
d(volume)/dx = 12x^2  400x + 2400
= 0 for a max of volume
3x^2  100x + 600 = 0  I divided by 4
x = (100 ± √(2800)/6
= 25.5 or 7.85
but clearly 0 < x < 20 or else the sides make no sense.
so the cutouts should be 7.85 by 7.85 cm
Plug 7.85 into my volume expression to get the max volume

calculus  Jeff, Sunday, July 31, 2011 at 7:27am
6. A right circular cylinder is to be designed to hold 750 cm3 of processed milk, and to use a minimal amount of material in its construction. Find the dimensions for the container.

calculus  Jeff, Sunday, July 31, 2011 at 7:27am
A right circular cylinder is to be designed to hold 750 cm3 of processed milk, and to use a minimal amount of material in its construction. Find the dimensions for the container.

calculus  Jed, Tuesday, August 9, 2011 at 8:53am
If you had a device that could record the Earth's population continuously, would you expect the graph of population versus time to be a continuous ( unbroken) curve? Explain what might cause breaks in the curve.
I'm confused. Thanks in advance for any help.

calculus  Jenny, Monday, April 30, 2012 at 11:57pm
Tony has a rectangular piece of cardboard which is 60 cm by 40 cm. By cutting squares from each corner of the cardboard and turning up the sides, can he form an opentopped box which will hold (a) 6656 cubic centimeter? (b) 9000 cubic centimeters? (c) what is the maximum amount of space he can obtain?
Answer This Question
Related Questions
 math  A cardboard box manufacturer wishes to make open boxes from rectangular ...
 Math  A cardboard manufacturer wishes to make open boxes from square pieces of ...
 Calc  A cardboard box manufacturer makes open boxes from rectangular pieces of ...
 math  A manufacturer of open tin boxes wishes to make use of pieces of tin with...
 Calculus  an open box is made by cutting out squares from the corners of a ...
 Calculus  A box with an open top is to be made from a square piece of cardboard...
 Calculus  An open box is formed from a piece of cardboard 12 inches square by ...
 CNHS  A manufacturer of open tin boxes wishes to use a piece of tin with ...
 algebra 2  you can make an open box from a piece of flat cardboard. First cut ...
 calculus  An open box is to be made out of a 8inch by 14inch piece of ...
More Related Questions