A four-cylinder gasoline engine has an efficiency of 28 % and delivers 220 J of

Question

A four-cylinder gasoline engine has an efficiency of 28 % and delivers 220 J of work per cycle per cylinder.

PART A

If the engine runs at 25 cycles per second (1500 rpm), determine the work done per second.

Express your answer to two significant figures and include the appropriate units.

Part B

What is the total heat input per second from the gasoline.

Express your answer to two significant figures and include the appropriate units.

Part C

If the energy content of gasoline is 130MJ per gallon, how long does one gallon last?

Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

Part A )

work done per second = 220 x 25 x 4 = 22000 J/s = 2.2 x 104 J/s

Part B)

heat input = (220/0.28) (25 x 4) = 7.9 x 104 J/s

Part c)

t = 130 x 106 /(7.9 x 104 ) = 1.7 x 103 sec

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