An airplane's jet engine is what kind of heat engine? O a. External O b. Both Oc. Internal O d. Neither A truck's diesel engine is what kind of heat engine? a. Internal O b. External O c. Both O d. Neither A campfire is what kind of heat engine? O a. Internal O b. External O c. Both O d. Neither A highly efficient combined cycle natural gas plant is what kind of heat engine? O a. Internal b. External Both Neither C. O d.

An airplane's jet engine is what kind of heat engine? O a. External O b. Both Oc. Internal O d. Neither A truck's diesel engine is what kind of heat engine? a. Internal O b. External O c. Both O d. Neither A campfire is what kind of heat engine? O a. Internal O b. External O c. Both O d. Neither A highly efficient combined cycle natural gas plant is what kind of heat engine? O a. Internal b. External Both Neither C. O d.

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter15: Thermodynamics

Section: Chapter Questions

Problem 27PE: This problem compares the energy output and heat transfer to the environment by two different types...

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What is the net work output of a heat engine that follows path ABBA in the figure above, with a straight line from B to D? Why is the work output less than for path ABCDA? Explicitly show how you follow the steps in the Problem Solving Strategies for Thermodynamics.
(a) How much food energy will a man metabolize in the process of doing 35.0 kJ of work with an efficiency of 5.00%? (b) How much heal transfer occurs to the environment to keep his temperature constant? Explicitly show how you follow the steps in the Problem—Solving Strategy for thermodynamics found in Problem-Solving Strategies for Thermodynamics.
This problem compares the energy output and heat transfer to the environment by two different types of nuclear power stationsone with the normal efficiency of 34.0%, and another with an improved efficiency of 40.0%. Suppose both have the same heat transfer into the engine in one day. 2.501014J. (a) How much more electrical energy is produced by the more efficient power station? (b) How much less heat transfer occurs to the environment by the more efficient power station? (One type of more ef?cient nuclear power station, the gas—cooled reactor, has not been reliable enough to be economically feasible in spite of its greater eficiency.)
(a) What is the best coefficient of performance for a refrigerator that cools an environment at 30.0C and has heat transfer to another environment at 45.0C ? (b) How much work in joules must be done for a heat transfer of 4186 kJ from the cold environment? (c) What is the cost of doing this if the work costs 10.0 cents per 3.60106J (a kilowatthour)? (d) How many kJ of heat transfer occurs into the warm environment? (e) Discuss what type of refrigerator might operate between these temperatures.
A power plant has been proposed that would make use of the temperature gradient in the ocean. The system is to operate between 20.0C (surface water temperature) and 5.00C (water temperature at a depth of about 1 km). (a) What is the maximum efficiency of such a system? (b) If the useful power output of the plant is 75.0 MW, how much energy is absorbed per hour? (c) In view of your answer to part (a), do you think such a system is worthwhile (considering that there is no charge for fuel)?
The efficiency of a Carnot heat engine is 25%. It takes 4000 J of heat input. What is the heat output? a. 3000 J. b. 5000 J. c. Cannot be determined. d. 1000 J. e. Approximately 5333 J.
An engine is able to do 1000 J of work. How much heat would need to be added for it to be as efficient as an electric motor? A.800 J B.1250 J C.8000 J D.1550 J
The burner in a hot air balloon adds 6400 J of heat to the balloon while the ballon expands. As the balloon expands, it does 3100 J of work on the surrounding air. What is the internal change in thermal energy of the balloon? A. + 6400 J B. - 3300 J C. + 9500 J D. + 3300 J
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Suppose a certain heat engine has an efficiency of 25%. In order for this heat engine to do 450 J of useful work, how much energy flows out at the the cool- temperature reservoir? O a. 2,250 J O b. 1,350 J O c. 113 J d. None of these choices. O e. 1,800 J
1. The formula for work in thermodynamics is given by PV = W. Suppose that at any pressure, P = h(V + V,") where V is the volume and V, is the initial volume. h and V, are constants. If work is to be maximized, what is the correct expression of maximum work in terms of constants? A. -1/2V. B. -h/2V. C. A(V, + 1)/4V, D. -h/4 E. None of these. A B.
34. Which of the following statements is a good representation of the 2nd law of thermodynamics: a. Energy can not be created or destroyed; it can only be converted from one form to another. b. Knowing the total internal energy of a system is not necessary, only the change of it is important in calculations of thermodynamic parameters. c. State variables are those parameters that are independent of the path of the thermodynamic process, and depend only on the current state of the system. d. Natural processes occur in a direction of dispersing the energy. e. In all processes whether natural or otherwise, the total energy is conserved.