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## woleraymond 3 years ago 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.

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1. shivam_bhalla

Tell me what you have done till now. How have you approached the problem ??

2. woleraymond

@shivam_bhalla i really dont ve any idea yet

3. shivam_bhalla

Tip: Do you know first law of Thermodynamics.?? If yes apply that

4. woleraymond

U = Q - PV but the question is messing me up, coast isnt clear yet

5. shivam_bhalla

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)??

6. woleraymond

work done is Pressure times change in volume

7. shivam_bhalla

Right. Now what is change in volume here??

8. woleraymond

i tink its zero

9. shivam_bhalla

Yes you are right No tell me What is Q ?

10. shivam_bhalla

Now tell me What is Q ?

11. woleraymond

120J?

12. shivam_bhalla

Yes. You gave me the answer :)

13. woleraymond

thanks

14. shivam_bhalla

Welcome :)

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