Calculate the rate of heat generation in kW due to the burning of the fuel when you drive a car rated at 34 MPG (miles per gallon) at a spee

Question

Calculate the rate of heat generation in kW due to the burning of the fuel when you drive a car rated at 34 MPG (miles per gallon) at a speed of 70 MPH (miles per hour), given that the heating value of gasoline, that is the heat generated when a unit mass of gasoline is burnt in air is 44 x 103 kJ/kg.

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Thu Thủy 4 months 2021-07-26T02:06:03+00:00 1 Answers 4 views 0

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    2021-07-26T02:07:38+00:00

    Answer:

    Explanation:

    Let us calculate gallon used in one hour .

    It travels 70 miles in one hour

    in 70 miles it uses 70 / 34 gallons of fuel

    70 / 34 gallons = 70 / 34 x 3.7854 kg

    = 7.8 kg

    heat generated = 7.8 x 44 x 10⁶ J

    = 343.2 x 10⁶ J

    This is heat generated in one hour

    heat generated in one second = 343.2 x 10⁶ / 60 x 60 J/s

    = 95.33 x 10³ J /s

    = 95.33 kW.

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