woleraymond
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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shivam_bhalla
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Tell me what you have done till now. How have you approached the problem ??
woleraymond
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@shivam_bhalla i really dont ve any idea yet
shivam_bhalla
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Tip: Do you know first law of Thermodynamics.?? If yes apply that
woleraymond
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U = Q - PV but the question is messing me up, coast isnt clear yet
shivam_bhalla
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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)??
woleraymond
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work done is Pressure times change in volume
shivam_bhalla
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Right. Now what is change in volume here??
woleraymond
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i tink its zero
shivam_bhalla
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Yes you are right No tell me What is Q ?
shivam_bhalla
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Now tell me What is Q ?
woleraymond
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120J?
shivam_bhalla
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Yes. You gave me the answer :)
woleraymond
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thanks
shivam_bhalla
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Welcome :)