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what is the weight of a ten foot length of steel pipe? the inside diameter of the pipe is 3/4 of an inch, and the outside diameter i one inch. steel weighs 490lbs. per cubic foot.

  • math -

    area outside = pi (1/2)^2 = pi/4 in^2
    area inside = pi (3/8)^2 = 9 pi/64 in ^2
    so cross sectional area = .25 pi - .14 pi
    = .11 pi in^2
    length = 120 in
    so
    volume = 120*.11 pi = 13.2 pi in^3
    then
    (13.2 pi in^3) (1 ft^3/12^3 in^3) (490 lb/ft^3
    = 3.74 pi lb
    =11.76 lb

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