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## Homework Statement

I have to construct 8 concrete right cylinders for hurricane protection on windows, but I need to know the height to fit the given criteria. Each has a 4 inch radius and each weighs 1200 pounds. Concrete weighs 150 pounds per cubic foot.

V= volume of right cylinder

r=radius

h= height of right cylinder

## Homework Equations

V=pi*r^2*h

## The Attempt at a Solution

V=pi*r^2*h

1200 lbs= pi*16*h

h=23.8732 inches (1’11.87”).

I just don’t know where the weight of concrete, 150 pounds per cubic foot, comes into play. Thank you very much.