Problem 38
A cylindrical glass jar has a plastic top. If the plastic is half as expensive as glass, per unit area, find the most economical proportion of the jar.

Solution:

 

Problem 39
039-figure-39.jpgA trapezoidal gutter is to be made from a strip of tin by bending up the edges. If the cross-section has the form shown in Fig. 38, what width across the top gives maximum carrying capacity?

Solution:

 

Problem 40
Solve Ex. 39, if the strip is 11 inches wide and the base is 7 inches wide.

Solution:

 
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