Mathematics (AS & A Level) · Feb / March 2016 · Paper 12 · Question 6
9709
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A vacuum flask (for keeping drinks hot) is modelled as a closed cylinder in which the internal radius is r cm and the internal height is h cm. The volume of the flask is 1000 cm3. A flask is most efficient when the total internal surface area, A cm2, is a minimum. 2 2000
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6(i)[3]
6(ii)[5]
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