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(b) A vacuum flask for keeping water hot is modelled as closed cylinder in which the internal radius is rcm and the internal height is h cm. The volume of the flask is 1000cm3. A flask is most efficient when the total internal surface area, Acm? is a minimum.

(b) A vacuum flask for keeping water hot is modelled as closed cylinder in which the internal radius is rcm and the internal height is h cm. The volume of the flask is 1000cm3. A flask is most efficient when the total internal surface area, Acm? is a minimum.

Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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(b) A vacuum flask for keeping water hot is modelled as closed cylinder in which the internal radius is rcm and the internal height is h cm. The volume of the flask is 1000cm3. A flask is most efficient when the total internal surface area, Acm² is a minimum.
Transcribed Image Text:(b) A vacuum flask for keeping water hot is modelled as closed cylinder in which the internal radius is rcm and the internal height is h cm. The volume of the flask is 1000cm3. A flask is most efficient when the total internal surface area, Acm² is a minimum.
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