PLZ HELP! A small tractor is 12% efficient at producing useful output from input fuel. How many joules of input fuel energy will this tractor need to produce 1000 J of useful output?

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12-01-2017
Physics

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PLZ HELP! A small tractor is 12% efficient at producing useful output from input fuel. How many joules of input fuel energy will this tractor need to produce 1000 J of useful output?

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AL2006 AL2006 · Answer 1 · 2017-01-12T03:28:07+01:00

AL2006 AL2006

12-01-2017

   Useful output = (efficiency) x (input energy)

   (1000 J) = (0.12) x (input energy)

Divide each side
by 0.12 : 1,000 J / 0.12 = input energy

   Input energy = (8,333 and 1/3) J

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