__________? MJ/mi (b) If the miles per gallon of the car is increased, does the

Question

__________? MJ/mi

(b) If the miles per gallon of the car is increased, does the amount of heat released to theatmosphere increase, decrease, or stay the same? Burning a gallon of gasoline releases 1.19 x 10^8 J ofinternal energy. (a) If a certain car requires 6.40 x 10^5J of work to drive one mile, how much heat is given off to theatmosphere each mile when the car gets 26.6 miles to the gallon? __________? MJ/mi (b) If the miles per gallon of the car is increased, does the amount of heat released to theatmosphere increase, decrease, or stay the same?

Explanation / Answer

Internal energy 1 gallon of gasoline E = 1.19 * 10 ^ 8J So, internal energy for   1 mile E ' = E /26.6    Since 1 gallon is used for 26.6miles                                                     = 0.447 * 10 ^ 7 J work done for 1 mile W = 6.4 * 10 ^ 5 J heat given to atmosphere Q = E ' - W                                           = 38.33 * 10 ^ 5 J (b) If the miles per gallon of the car is increased, the amount of heat released to theatmosphere decrease

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