Calculate the volume of gasoline (in L) that a car requires to maintain constant speed if...
Calculate the volume of gasoline (in L) that a car requires to maintain constant speed if the car needs to overcome the air drag, which causes a total of 200 MJ of energy loss due to friction. Ignore any other forms of friction. Assume the efficiency of the engine is 22%. Each litre of gasoline has 35 MJ of energy. Express your answer with one decimal place
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Homework Answers
Since the car is moving with constant speed, only work done is aganst friction. That is car needs 200 MJ of energy to overcome friction. Each litre of gasoline can provide 35 MJ of energy. Efficiency of engine is 22 %.
If N litre of gasoline is used up, energy generated is ( 35 x N ) MJ. Only 22 % of this is used by car to overcome friction.
That is ( 22/100 ) x 35 x N = 200
number of litre of Gasoline needed is N = 26.0 Litres
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