Recent content by physics.stu

First Law: dU = Q-W; dU=0.0J because it returns to initial state (cyclic engine) I am NOT running a Carnot engine, it's the only thing that I could solve for. Second Law: thermal energy will flow spontaneously from a hot object to cold object but cannot spontaneously flow from cold to hot...

I think you're right Tia. I used W=PdV and dU=Q-W to find W and Q. Thanks for your help!

1. Thot reservoir= 600K, Tcold reservoir= 300K, Output= 0.5 J of work for every J of thermal energy extracted from the hot reservoir. What is Qh? 2. efficiency= W/Qh; Carnot efficiency= 1- (Tcold/Thot); 3. I have found the Carnot efficiency to be 0.50. I don't know where to go...

I found that Pa= 10Pc so I was able to find Vc and b-->c is isovolumetric so Vc=Vb. The only question remaining is what type of process could this be?! Thank you all for your replies. It's not isobaric/choric because both pressure and volume are changing. I'm glad you all agree that it can't be...

Homework Statement I'm taking a practice test and I need some help with a heat engine problem. There are three parts, the one that's giving me trouble is a-->b. The Volume v. Pressure graph shows a straight line. Pa= 5 atm Va= 5 L Ta=300K and Tb=800K are given. So pressure is decreaseing...