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Energy calculation

  • Thread starter boyblair
  • Start date
  • #1
8
0
Hi everyone!

I am having a bit of a problem solving the following question (not good with maths), and would be very grateful for any advice given.

Homework Statement



A car is run for 400 hours per year, with a total mileage of 10,000 a year. The car uses diesel and consumes 2,000 litres per year. A litre of diesel cost £1.10 and holds 38.7MJ of primary energy.

a) Calculate the mean engine power?

b) If the engine is 20% efficient overall, how much energy would need to be stored in 95% efficient batteries to give a range of 300 miles on full battery charge?

Many thanks,
 

Answers and Replies

  • #2
djeitnstine
Gold Member
614
0
you say you're not good at math but that doesn't tell us where you need help at.

Where is your attempt?
 

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