12. [-/2 Points]DETAILSSERPSE9 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?kWNeed Help?Master ItAdditional MaterialseBook

Given data: Cold Temperature Tc = 430oC = 703 K Hot Temperature Th = 1870oC = 2143 K Actual…

Answered: 12. [-/2 Points] DETAILS SERPSE9…

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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(a) How much heat transfer occurs to the environment by an electrical power station that uses 1.251014J of heat transfer into the engine with an efficiency of 42.0%? (b) What is the ratio of heat transfer to the environment to work output? (c) How much work is done?
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.)
9.The heat exhausted to the heat sink by a gasoline heat engine of a SUV is twice the mechanical work done. What is its efficiency? O A. 33 % O B. 0.33 O C. 33.3 % O D. 0.667
2. A 70 kg hiker climbed a mountain 1000 m high. He reached the peak in 3 hr. A. Calculate the external work done by the climber. B. Assuming the work was done at a steady rate during the 3 hr period. Calculate the power generated during the climb. -i C. Assuming the average O2 consumption during he climb was 2 liters/min (corresponding to 9.6 kcal/min), find the efficiency of the hiker's body. D. How much energy appeared as heat in the body?
4. A heat engine operates between energy reservoirs of 75°C and 450°C. What is the maximum efficiency of this heat engine? Express your answer as a decimal, between 0 and 1. 5. A heat engine is operated between two energy reservoirs at different temperatures, where 10,200[J] of thermal energy flows out of the hot reservoir. If the engine has an efficiency of 0.15, what is the work performed by the engine? Express your answer in Joules.
Calculate the efficiency of a heat engine operating between two reservoirs at temperatures T₁ = 400 K and T₂ = 300 K. Select one: O a. η = 0.25 - Ο b. η = 3.0 O c. n = 4.0 O d. n = 0.33333333333333
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.
B. Solve the following problems. 1. A Carnot engine is operated between two heat reservoirs at temperatures of 520K and 300K. What is the thermal efficiency of the engine? 2. A steel ball with a mass of 1 kg rolls down a cliff. Complete the table below. KE (J) ME (J) v (m/s) PE (J) h (m) 100 10 8 6. 4
How much energy will be consumed by a 400W rice cooker operating for half an hour?a. 12 Jb. 24 kJc. 72 kJd. 720 kJ8. A metallic key ring is cooled down. Which of the following will happen to the insidediameter of the key ring?a. Shrinkb. Expandc. Stay at the same sized. None of the above9. What happens to the internal energy of a gas if increasing temperature under constantvolume?a. Decreaseb. Increasec. Do not changed. Cannot be determined
1. An inventor claims to have developed a wonderful new heat engine that operate with a relatively cool flame at 145 degrees celcius and discharges waste heat to the environment at 25 degrees celcius. Calculate the maximum efficiency that can be expected for such an engine 2. A heat engine in each cycle extracts 5,000 J of thermal energy and rejects 2,000 J of thermal energy. How many joules of work are done each cycle. What is the efficiency of the engine;
5. A heat engine with a high temp reservoir at 400K has an efficiency of 0.20. What is the max possibletemp of the cold reservoir?
An engine has an electric generator that operates between 1870°C and 430°C. a. What is its maximum theoretical efficiency? b. Suppose that its actual efficiency is 42%. How much mechanical power does the engine deliver if it absorbs 140000 J of energy each second from the hot reservoir.

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