SOLUTION: An engine burns 1.4 kg of gasoline per hour and yields 3.5 kW of power. Calculate the efficiency of the engine when the heating value of gasoline is 43 MJ/kg. PLEASE HELP

Question 402686: An engine burns 1.4 kg of gasoline per hour and yields 3.5 kW of power.
Calculate the efficiency of the engine when the heating value of gasoline is
43 MJ/kg.
PLEASE HELP
Answer by scott8148(6628) (Show Source): You can put this solution on YOUR website!
the heat energy in the gasoline is ___ (1.4 kg) * (43 MJ/kg) = 60.2 MJ

one Watt is one Joule per second
3600 sec in an hr

power generated is ___ (3.5 kW) * (3600 sec) = 12.6 MJ

efficiency is ___ (12.6 MJ) / (60.2 MJ) ___ expressed as a percent
RELATED QUESTIONS
The Hawaii Natural Energy Institute tested a 100 kW OTEC system (ocean thermal energy... (answered by ikleyn)

The efficiency e of a gasoline engine as a function of its compression ratio r is given... (answered by Boreal)

an engine pulls a train 140 miles. then a second engine, whose average rate is 5 miles... (answered by josmiceli)

The efficiency of an engine is the proportion of its fuel energy that the engine can... (answered by ikleyn)

Given 98% gasoline and 2% motor oil. New engine is 96% gasoline and 4% oil. write an... (answered by josgarithmetic,Theo)

an ambassador car weighing 2 tones accelerate at rate of 3m/s^2. in the first gear from a (answered by solver91311)

One gallon of gasoline in an automobile's engine produces on the average 9.5 kg of carbon (answered by josmiceli)

The engine of a sports car rotates at 5,000 revolutions per minute (rpm). Calculate the... (answered by stanbon)

A man bought new car from showroom and against advice, drives off at a fixed high speed... (answered by Boreal)