Your submitted answer(s) for question 2 are :Submission 1: 119.94Submission 2: 226.1122. An ideal heat engine takes in heat from a reservoir at 370 °C and has an efficiency of 28%. If the exhaust temperature does not vary and the efficiencyis increased to 50%, what would be the increase in the temperature of the hot reservoir?| 226.112] °CShow my other submissions]

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College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter15: Thermodynamics

Section: Chapter Questions

Problem 43PE: Suppose you want to operate an ideal refrigerator with a cold temperature of 10.0C, and you would...

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An ideal gas expands isothermally along AB and does 700 J of work (see below). (a) How much heat does the gas exchange along AB? (b) The gas then expands adiabatically along BC and does 400 J of work. When the gas returns to A along CA, it exhausts 100 J of heat to its surroundings. How much work is done on the gas along this path?
When a dilute gas expands quasi-statically from 0.50 to 4.0 L, it does 250 J of work. Assuming that the gas temperature remains constant at 300 K, (a) what is the change in the internal energy of the gas? (b) How much heat is absorbed by the gas in this process?
Five moles of a monatomic ideal gas in a cylinder at 27 is expanded isothermally from a volume of 5 L to 10 L. (a) What is the change in internal energy? (b) How much work was done on the gas in the process? (c) How much heat was transferred to the gas?
One mole of an ideal gas is initially in a chamber of volume 1.0102 m3 and at a temperature of 27 . (a) How much heat is absorbed by the gas when it slowly expands isothermally to twice its initial volume? (b) Suppose the gas is slowly transformed to the same final state by first decreasing the pressure at constant volume and then expanding it isobarically. What is the heat transferred for this case? (c) Calculate the heat transferred when the gas is transformed quasi-statically to the same final state by expanding it isobarically, then decreasing its pressure at constant volume.
2.3 Study the following p-V diagram in figure 1 and answer the que P (N/m) 15 - B A. 10 C. V (m) Figure 1 10 20 30 Calculate: (a) Work done through process A to B (WAB) (b) work done through the process B to C (Wsc): (c) internal energy UAB, if 120J of energy as heat enters the syst (d) the net work done by the system.
1. (a) What is the best coefficient of performance for a refrigerator that cools an environment at -26° C and has heat transfer to another environment at 49 ° C? COP ref (b) How much work must be done for a heat transfer of 4186 kJ from the cold environment? W = (c) What is the cost of doing this if the work costs 10.0 cents per 3.6 x 106 J (a kilowatt-hour)? Cost in cents = (d) How many kJ of heat transfer, Qh occurs into the warm environment? Qn kj = Think about what type of refrigerator might operate between these temperatures. Hint: Use the appropriate formula for a refrigerator which is different from a heat pump.
4. A typical coal-fired power plant operates with a high-temperature reservoir at Th = 800 K and a low-temperature reservoir at Tc = 300 K. What is the maximum efficiency allowed by the 2nd law of thermodynamics (the Carnot efficiency) for a heat engine operating between these temperatures? Give your answer as a decimal number, not as a percentage. (This isn't in section 4.2, so you might want to also take a quick look at equation 4.5 in section 4.5 of the textbook, or at the introductory material in this week's lab write-up.)
8000 J of heat are added to an ideal monatomic gas in an isovolumetric process. The gas then undergoes an isobaric expansion at 0.2 atm pressure. The two processes happen such that the final temperature is equal to the initial temperature. What is the change in volume for the gas? [Your answer will be in terms of m3]
A steam engine is operating at its theoretical maximum efficiency of 60%. If the waste heat has a temperature of 100 °F (38 °C), what is the temperature of the broiler in degree Celsius? Note: Be careful. 94. 225. 350. 504. 775.
12. [-/2 Points] DETAILS SERPSE9 22.P.015.MI.FB. One of the most efficient heat engines ever built is a coal-fired steam turbine in the Ohio River valley, operating between 1 870°C and 430°C. (a) What is its maximum theoretical efficiency? % (b) The actual efficiency of the engine is 42.0%. How much mechanical power does the engine deliver if it absorbs 1.90 x 105 J of energy each second from its hot reservoir? kW Need Help? Master It Additional Materials eBook
Please answer the following question(s): 1. (a) What is the best coefficient of performance for a refrigerator that cools an environment at -28° C and has heat transfer to another environment at 47 ° C? COP ref (b) How much work must be done for a heat transfer of 4186 kJ from the cold environment? W = kj (c) What is the cost of doing this if the work costs 10.0 cents per 3.6 × 106 J (a kilowatt-hour)? Cost in cents = ✓ (d) How many kJ of heat transfer, Qh occurs into the warm environment? Qh= kj Think about what type of refrigerator might operate between these temperatures. Hint: Use the appropriate formula for a refrigerator which is different from a heat pump.
An engineer designs a heat engine using flat-plate solar collectors. The collectors deliver heat at 74°C and the engine releases heat to the surroundings at 32°C. What is the maximum possible efficiency of this engine? (Round the final answer to four decimal places.) The maximum efficiency of the engine is __%

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