An open cylindrical can is made from iron sheet to hold 4000 cm^3 of water. The bottom of the can is cut from a square sheet of iron.
(a) Show that the total area A (cm^2) of the material used can be expressed in terms of the radius r (cm) of the can as A = 4r^2 + 8000/r .
(b) Find the radius of the can that requires the least amount of material and the material used.
Problem of minimization
2011-01-20 5:02 am
回答 (4)
2011-01-20 7:32 am
2011-01-20 8:02 am
haha......
2011-01-20 5:31 am
I have checked once again... it certainly has no typing mistake....
I just directly copy from my textbook.
I just directly copy from my textbook.
2011-01-20 5:19 am
4 is typing mistake of π ? πr^2 represents the base area of the can.
收錄日期: 2021-04-22 00:52:04
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110119000051KK01151