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Homework answers / question archive /  1)Write the three Fundamental Laws of Thermodynamics   Zeroth Law: temperature equivalence (Ta=Tb, Tb=Tc, Ta=Tc) First Law: Conservation of energy Second Law: Increase of entropy   2

 1)Write the three Fundamental Laws of Thermodynamics   Zeroth Law: temperature equivalence (Ta=Tb, Tb=Tc, Ta=Tc) First Law: Conservation of energy Second Law: Increase of entropy   2

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 1)Write the three Fundamental Laws of Thermodynamics

 

Zeroth Law: temperature equivalence (Ta=Tb, Tb=Tc, Ta=Tc)

First Law: Conservation of energy

Second Law: Increase of entropy

 

2. Which of the following properties truly reflect the energy content of the molecule? 

            a) specific volume, v   b) internal energy, u     c) enthalpy, h  d) entropy, s

 

3. Which of the following is the correct unit and concept for power ? 

                        a) J (mass x acceleration)         b) W (energy/time)                    

                        c) J (force x distance)             d) W (energy x distance)

 

4. Write the energy balance for the following system ?

                 

 

 

 

5. Which of the following reaction does not follow the conservation of mass? 

                        a) Thermal                   b) Electrical                  

                        c) Nuclear                    d) none of the above

 

6. If a motor needs 100W to operate and does 20W of work and dissipates 80W of heat, what is its efficiency?

                        a) 0.2                           b) 0.8                

                        c) 0.4                           d) 0.6

 

7. How many independent intensive properties do you need to fully describe the state of a simple compressible substance inside the vapor dome? 

                        a) 1                              b) 2                   

                        c) 3                              d) 4

 

8. You are boiling your potatoes in an open stove on Mount Everest. You need to? 

                        a) cook it longer                       b) cook it shorter          

                        c) cook it the same amount of time d) depends on the weather

 

9. You are boiling water in a pressure controlled aircraft (1 bar) which is 30,000 ft in the air? What is true compared to doing the same things at sea level? 

The water will boil at a lower temperature                    

The water will boil at a higher temperature                   

The water will boil at the same temperature      

The water will not move into the vapor dome

 

10. Which is not a state on the P-v-T surface? 

                        a) liquid                       b) saturated vapor         

                        c) plasma                     d) liquid and vapor mixture

 

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