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26 January, 10:48

A concrete column has a diameter of 380 mm and a length of 2.6 m. if the density (mass/volume) of concrete is 2.45 mg/m3, determine the weight of the column in pounds.

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  1. 26 January, 11:03
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    The volume of the column is

    (π) · (r²) · (length) =

    (π) · (0.19 meter) ² · (2.6 meters) =

    (π) · (0.036 m²) · (2.6 m) =

    0.294 m³.

    The density is 2,450 kg/m³ (VERY very dense, heavy concrete)

    so the weight of the column is (mass) · (gravity) or

    (density) · (volume) · (gravity) =

    (2,450 kg/m³) · (0.294 m³) · (9.81 m/s²) =

    (2,450 · 0.294 · 9.81) (kg · m³· m) / (m³ · s²) =

    7,066 kg-m/s² = 7,066 Newtons.

    But 9.81 Newtons = 2.20462 pounds on Earth (the weight of 1 kilogram of mass), so we have

    (7,066 N) · (2.205 pound/9.81 N) =

    (7,066 · 2.205 / 9.81) pounds =

    1,588 pounds.
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