*96. D Heat flows from a reservoir at 373 K to a reservoir at 273 Kthrough a 0.35-m copper rod with a cross-sectional area of 9.4 × 10-4m? (see the drawing). The heat then leaves the 273-K reservoir and entersa Carnot engine, which uses part of this heat to do work and rejects theremainder to a third reservoir at 173 K. How much of the heat leavingthe 373-K reservoir is rendered unavailable for doing work in a periodof 2.0 min? 373 K273 KCopperrod|w|Carnotengine173 K

Given data: The temperature of the reservoir 1 is T1=373 K. The temperature of the reservoir 2 is…

Answered: *96. D Heat flows from a reservoir at…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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8.4 A cylinder is equipped with a tight - fitting but easily movable piston. The cylinder contains 2.0x10^-4 m^3 of gas with normal air pressure. With a bunsen burner, the cylinder is heated until ga - then doubled its volume. a) Calculate how much work the gas does during the expansion b) How much does the internal energy change during the expansion of the gas have 5 degrees of freedom? c) How much heat has been added to the gas during the expansion?\
3. A heat engine does not convert all of the heat that flows through it into 2 mechanical energy. Which statement explains this fact? * All heat engines must discard waste heat, which is not converted to mechanical energy. A fraction of the input energy is trapped as internal energy during each cycle of the heat engine. At least half of the input energy is lost to friction. F6 F7 F8 F9 F10 F11 F12 & 6 7 8 Y U
13. The temperatures To of the cold reservoirs and the temperatures T, of the hot reservoirs for four Carnot heat engines are engine 1: Tc = 400K and T₁ = 500K engine 2: T = 500K and T₁ = 600K engine 3: Tc = 400K and T₁ = 600K engine 4: Tc = 600K and TH = 800K Rank these engines according to their efficiencies, least to greatest. A. 1, 2, 3, 4 B. 1 and 2 tie, then 3 and 4 tie C. 2, 1, 3, 4 D. 1, 2, 4, 3 E. 2, 1, 4, 3
3. A system does 1.80×10° Jof work while 7.50×108 J of heat transfer occurs to the environment. What is the change in internal energy of the system assuming no other changes (such as in temperature or by the addition of fuel)?
B5
4) A ground source heat pump heats a building by extracting heat from the ground and pumping it into the building. Define: Qc = heat extracted from the ground, Qn= heat pumped into the building, W = electric energy used by the heat pump, Tc= temperature of the ground, T = temperature of building (Qc, Qn, and W are positive by definition). Assume Tr > Tc. a) Draw a diagram showing energy flow in and out of the heat pump. b) Write a general expression for the change AS in the entropy of the "universe", that is the heat pump plus the cold and hot reservoirs, in terms of the quantities defined above. Now assume ideal (reversible) operation, and take Te= 10 °C and Tp= 20 °C. What is the coefficient of performance (ČOP) of the heat pump? By what factor would this change if we had Tc = 0 °C instead?
Q3 The gases in the cylinder of an internal combustion engine have a specific internal energy of 800 kl/kg and specific volume of 0.06 m:/kg at the beginning of expansion. The expansion of the gases may be assumed to take place according to a reversible law, pv"= constant, from 55 bar to 1.4 bar. The specific internal energy after expansion is 230 kJ/kg. Calculate the heat rejected to the cylinder cooling water per kilogram or gases during the expansion stroke. The worke done by the system is 465.96 kj/kg
6
Q2. What is the total change in entropy when 5.0 kg Of water at 15'℃ is brought into contact with a large heat reservoir at 1000C, after the water reached the temperature of the reservoir - -4186 J/kg,K 18. O
7
A 1.0-kilogram cube of ice made from distilled water initially at 0 degree Celsius is placed in an adiabatic vessel containing 2.0 liters of distilled water initially at a temperature of 25 degrees Celsius. Using the information given below, answer the questions that follow: a. How many grams of the ice melts at the equilibrium condition b. How many grams of the ice will remain unmelted (if there's still any) at the equilibrium condition? c. What is the absolute temperature (in Kelvins) at the equilibrium condition? Water liquid form ice form density (g/mL) 1.00 0.997 Cp (J/ K*mole) 75.35 37.71 ΔHfusion (KJ/mole) 6.02 ΔHvaporization (KJ/mole) 40.657
A power plant that uses an organic fluid, such as alcohol, as the working fluid can be operated between the top and the bottom portions of the pond. If the water temperature is 35°C near the surface and 80°C near the bottom of the pond, determine the maximum thermal efficiency that this power plant can have. Is it realistic to use 35 and 80°C for temperatures in the calculations? Explain.

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