anonymous
  • anonymous
How much work can be extracted from 5.00 × 10^4 J of heat when 2.00 × 10^4 J of heat is exhausted? A. - 7.00 × 10^4 J B. - 3.00 × 10^4 J C. 3.00 × 10^4 J D. 7.00 × 10^4 J ***thank you:)
Physics
jamiebookeater
  • jamiebookeater
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Michele_Laino
  • Michele_Laino
I think that we have to apply the first principle of thermodynamics
anonymous
  • anonymous
ok!
Michele_Laino
  • Michele_Laino
so, we can write this: \[Q = L + \Delta U\]

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Michele_Laino
  • Michele_Laino
where Q= 2*10^4 Joules, and \Delat U = 5*10^4 Joules
Michele_Laino
  • Michele_Laino
oops..\Delta*
anonymous
  • anonymous
okay!! so we get 70000? so our solution is choice D?
Michele_Laino
  • Michele_Laino
no,we have: \[2 \times {10^4} = L + 5 \times {10^4}\]
anonymous
  • anonymous
ohh oops!! so we get 20000 = L + 50000 L = - 30000 ? so we solution is choice B?
Michele_Laino
  • Michele_Laino
yes! That's right!
anonymous
  • anonymous
yay:) thank you!! :)
Michele_Laino
  • Michele_Laino
thank you!! :D

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