A hot-water tank has the form of a circular cylinder of internal radius r, topped by a
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A hot-water tank has the form of a circular cylinder of internal radius r, topped by a hemisphere as shown in Figure 2.8. Show that the internal surface area A is given by
Find the formula relating the value of A to the value of r for tanks with capacity 0.15m3. Complete the table below for A in terms of r and draw a graph to represent the function.
The cost of the tank is proportional to the amount of metal used in its manufacture. Estimate the value of r that will minimize that cost, carefully listing the assumptions you make in your analysis.
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