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.

Question

anonymous · Answer

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

anonymous · Answer

@shivam_bhalla i really dont ve any idea yet

anonymous · Answer

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

anonymous · Answer

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

anonymous · Answer

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 · Answer

work done is Pressure times change in volume

anonymous · Answer

Right.  Now what is change in volume here??

anonymous · Answer

i tink its zero

anonymous · Answer

Yes you are right  No tell me What is Q ?

anonymous · Answer

Now tell me What is Q ?

anonymous · Answer

120J?

anonymous · Answer

Yes.  You gave me the answer :)

anonymous · Answer

thanks

anonymous · Answer

Welcome :)