anonymous
  • anonymous
Calculate how much heat is needed to be supplied to a gas at a pressure of 1.25 x10^5 Pa, such that the pressure increases by 25 per cent at constant volume, and the internal energy by 120J.
Physics
katieb
  • katieb
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anonymous
  • anonymous
Tell me what you have done till now. How have you approached the problem ??
anonymous
  • anonymous
@shivam_bhalla i really dont ve any idea yet
anonymous
  • anonymous
Tip: Do you know first law of Thermodynamics.?? If yes apply that

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anonymous
  • anonymous
U = Q - PV but the question is messing me up, coast isnt clear yet
anonymous
  • anonymous
Ok. You are right. Now We have to find Q-->Heat supplied It is given that change in internal energy ( U ) = 120 J Now we have to find W? Now tell me the formula for W(work done)??
anonymous
  • anonymous
work done is Pressure times change in volume
anonymous
  • anonymous
Right. Now what is change in volume here??
anonymous
  • anonymous
i tink its zero
anonymous
  • anonymous
Yes you are right No tell me What is Q ?
anonymous
  • anonymous
Now tell me What is Q ?
anonymous
  • anonymous
120J?
anonymous
  • anonymous
Yes. You gave me the answer :)
anonymous
  • anonymous
thanks
anonymous
  • anonymous
Welcome :)

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