question in me203 who gonna answer it ?

انت اختصرت الفورملا اتوقع بس اذا حطيت Energy balance َ
Q - W = Delta U + Delta KE + Delta PE
where W = W(boundry) + W(other)

For Constant Pressure : W(boundry) + Delta U = Delta H

عوض بالمعادلة حقت الانرجي و تطلع معاك

Q - W(other) = Delta U + Delta KE + Delta PE

في حالتك الحرارة و الطاقة الكامنه و الحركية تساوي صفر

 

In problems with flowing fluids, use h instead of u.

This is because of the relation
h = Pv+u
So, in turbines, compressors, heat exchangers, etc, where there is a flow of fluids, h is used to save the time of calculating the energy of the flow.

 

هنا غلطت انا و كتبت دلتا يو و المقصد كان دلتا اتش

لكن اتوقع الرد الثاني اوضح ان شاء الله

 

in piston cylinder
for example
w=(integral)(P*dV),Note that integration is from V1 to V2
P has to be in written in term of V in order to evaluate the integration.
Or if P is constant, we can factor it out of the integration to become :
w=P*(V2-V1), Regards