Question

Can someone please help out with these questions? Thanks.

1. State the First Law of Thermodynamics 2. What are the sign conventions for the heat O and the work W . How is the First Law related to conservation of energy? 4. Define internal energy 5. Does internal energy depend on path, in other words how a system got to the state its in? 6. How does the First Law apply to weight gain? . What is an irreversible process? 8. Define heat engine 9. Sketch Fig. 15.7 10. Given a plot of pressure vs. volume for a thermodynamic process, how do you find the work done? 11. (T/F) For a thermodynamic process, work and heat are independent of path 12. Define isobaric, isochoric, isothermal, and adiabatic 13. If you have a closed loop on a PV diagram, the work done is: 14. Define reversible process 15. State the Second Law of Thermodynamics, both the first and second versions 16. Give an everyday example of the Second Law of Thermodynamics 17. What is Δυ for a cyclical process? 18. For a refrigerator, where is the hot reservoir and where is the cold reservoir? 19. For a heat pump, where is the hot reservoir and where is the cold reservoir? 20. An inventor claims that they have created an engine that is more efficient than a Canot engine operating between the same two temperatures. Why are they lying?

Answer 1

1. The first law of thermodynamics states that the amount of heat given to (taken from ) the system is equal to the sum of increase (decrease) of internal energy of the system and the work done by (on ) the system.

2. Heat gained by system is positive and heat lost by system is negative.

Work done by system is positive and work done on system is negative.

3. As conservation of energy states that energy can never be created not be destroyed but can be converted into one form to another.Here energy is converted internal energy and work done which states that first law follows conservation of energy law.

4.The sum of total kinetic energy and potential energy of all molecules of a system is called internal energy of the system.