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9 September, 01:39

Neglecting the presence of friction, air drag, and other inefficiencies, how much gasoline is consumed when a 1300 kg automobile accelerates from rest to 80 km/h. Assume the density and enthalpy of gasoline are 680 kg/m3 and 45 MJ/kg respectively. Express your answer in the units of mL. Show all work and use SI units for full credit. Box your final answer (s)

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  1. 9 September, 01:41
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    Given that,.

    Mass of car is

    M = 1300kg

    Velocity of car

    V = 80km/h = 80 * 1000/3600

    V = 22.22m/s

    Calculate the kinetic energy of the vehicle as follows:

    K. E = ½ MV²

    K. E = ½ * 1300 * 22.22²

    K. E = 320,987.65 J

    Given that,

    Enthalpy is 45MJ / kg

    h = 45MJ / kg

    Then, enthalpy is given as.

    Enthalpy = Energy / mass

    h = E / m

    45 * 10^6 = 320,987.65 / m

    m = 320,987.65 / 45 * 10^6

    m = 7.133 * 10^-3 kg

    m = 7.133 mg

    Also, given that, density is 680kg/m³

    Density is given as

    Density = mass / Volume

    ρ = m / v

    Then, v = m / ρ

    v = 7.133 * 10^-3 / 680

    v = 1.049 * 10^-5 m³

    We know that

    1mL = 10^-6 m³

    Therefore,

    v = 1.049 * 10^-5 m³ * 1mL / 10^-6m³

    v = 10.49 mL
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