Cubic Foot
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 NEW Green Packing Peanuts Anti-Static 20 Cu. Ft. CF Cubic Foot *150+ Gallons* US $49.95
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How many cubic feet in a 5 foot round sphere?
assuming the sphear is 1 inch thick steel, how many cubic feet of air will it be able to hold?
Use the volume equation of a sphere:
Volume = (4/3)*pi*r^3.
You need to find the radius of the sphere, not including the thickness, because this is the volume that can occupy air.
I assum the 5 feet refers to the circumference of the sphere, thus:
C=2*pi*r, meaning r = c/[2*pi] = 0.8 ft
Since this is the radius of the entire sphere, we need to subtract the thickness in order to obtain the radius of the sphere that is able to hold air:
R' = Radius of sphere - thickness = [0.8 ft]- [1/12 ft] = 0.72 ft
Now you can find the voulme of the sphere you are looking for:
Volume = 4/3*pi*R'^3 = (4/3)*pi*(0.72)^2 = 1.56 ft^3
Hope this helps
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