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10 September, 10:40

Determine the density of a rectangular piece of concrete that measures 3.7 cm by 2.1 cm by 5.8 cm and has a mass of 43.8 grams.

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  1. 10 September, 12:17
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    It is customary to work in SI units.

    Calculate the volume of the concrete.

    V = 3.7*2.1*5.8 cm³ = 45.066 cm³ = 45.066 x 10 ⁻⁶ m³

    The mass is 43.8 g = 43.8 x 10⁻³ kg

    The density is mass/volume.

    Density = (43.8 x 10⁻³ kg) / (45.066 x 10⁻⁶ m³) = 971.9 kg/m³

    Answer: 971.9 kg/m³
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