anonymous
  • anonymous
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.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
i dont even know where to start
anonymous
  • anonymous
ANY help, even a formula or a rule or a hint, anything will help
anonymous
  • anonymous
i just know efficiency = input/output

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anonymous
  • anonymous
Yep, calm down.,,
anonymous
  • anonymous
oh, sorry, it is output/input
anonymous
  • anonymous
ok,.... i am calm
anonymous
  • anonymous
The heating value is the amount of heat energy produced by complete combustion in a given quantity. Take a basis of 1 hour. Then your engine burns 1.4kg of gasoline, which yields a maximal amount of thermal energy to use for work as\[43MJ/kg \times 1.4 kg=60.2MJ\]In one hour, your engine produces from this energy, \[\frac{3500J}{s}\times \frac{3600s}{h}=12.6MJ\]The efficiency is the amount of work per unit energy input, which is \[\eta = \frac{12.6MJ}{60.2MJ}=0.209\]to 3 significant figures.
anonymous
  • anonymous
This is the first time I've used 'heating value' for anything like this, so if the answer's wrong, I couldn't find an appropriate definition.
anonymous
  • anonymous
so, can i say that efficiancy is 20.9%?
anonymous
  • anonymous
Yes
anonymous
  • anonymous
ok, thank you, i already faned you long time ago, so cant fan again :(
anonymous
  • anonymous
Yeah I know - no worries :)
anonymous
  • anonymous
The answer makes sense - I've seen values between 10 and 50% for internal combustion engines.
anonymous
  • anonymous
then it is probably correct, i also know that cobustion engines are very unefficient
anonymous
  • anonymous
hey anwar
anonymous
  • anonymous
hi :)
anonymous
  • anonymous
want a fan?
anonymous
  • anonymous
would you be one if I say yes?
anonymous
  • anonymous
...
anonymous
  • anonymous
lol
anonymous
  • anonymous
you got it
anonymous
  • anonymous
thanks!!
anonymous
  • anonymous
anwar, can you please fan lokisan, because he helped me alot and i can only fan him once
anonymous
  • anonymous
lol you really care about others :P.. I already did anyways
anonymous
  • anonymous
so you faned me just as an exchange for me to fan the guy huh? :(
anonymous
  • anonymous
nah, would have faned you anyway
anonymous
  • anonymous
lol andy, you and your fanning job~ ^_^

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