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1 May, 05:54

Compute the order of magnitude of the mass of a bathtub half full of pennies. (Assume the pennies are made entirely of copper.)

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  1. 1 May, 06:40
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    Mass = 873.6kg = 0.874 * 10^3 kg

    Order = 3

    Question:

    Compute the order of magnitude of the mass of a bathtub half full of pennies. (Assume the pennies are made entirely of copper and the tub measures 1.3 m by 0.5 m by 0.3 m)

    Explanation:

    Given:

    Dimensions of the tub = 1.3 m by 0.5 m by 0.3 m

    Density of copper d = 8960kg/m^3

    Mass = volume * density

    Volume of tub = L*B*H = 1.3 * 0.5 * 0.3 = 0.195m^3

    Since the tub is half full:

    V = 0.195/2 = 0.0975m^3

    Mass = 8960kg/m^3 * 0.0975m^3

    Mass = 873.6kg = 0.874 * 10^3 kg

    Order = 3

    Note: Order of magnitude is of the form:

    N = a * 10^b

    Where;

    b = order of magnitude

    and

    1/√10 < / = a < √10
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