Part C :
Given, the gasoline engine takes in 1.72 x 104 Joule of heat and delivers 4000 J of work per cycle. And the heat of combustion of gasoline is 4.00 x 104 J/g .
i.e. engine needs 1.72 x 104 J of energy in one cycle. And
1 g of gasoline produces 4.00 x 104 J of energy .
So, For 1.72 x 104 J of energy we need
of gasoline (in one cycle) .
Part D :
The engine produces 4000 J of energy in one cycle .
So, in 70 cycles it will produce 4000 x 70 = 280000 J of energy.
According to the question, the engine goes through 70.0 cycles per second.
i.e. engine is producing 280000 J of energy per second .
Hence, the power of the engine is 280000 J/s or 280000 W or 280 kW (kilowatts) .
Part E :
We know that
1 kilowatt = 1.341 horsepower
So, 280 kilowatt = 280 x 1.341 = 375.486 horsepower
Hence, the power output of engine is 375.46 horsepower .
For any doubt please comment and please give an up vote. Thank you.
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