Question 726127
How many cubic feet of sand will I need to fill a pipe 1.5" I.D. which is 10 feet long?
:
Use the volume of a cylinder: V = {{{pi*r^2*h}}}
Diameter of 1.5, a radius of .75 inches
Change length to inches also; 12(10) = 120 inches
V = {{{pi*.75^2*120}}}
V ~ 212 cu/in
:
Change to cubic ft, there are  1728 cu/in in 1 cu/ft
{{{212/1728}}} = .123; roughly {{{1/8}}} cu/ft