Referring to the figure shown below, water contained in a piston-cylinder assembly, initially at 1.5 bar and a quality of 40%, is heated at constant pressure until the piston hits the stops. Heating then continues until the water is saturated vapor. The initial height, L₁, is 0.05 m and the change in height, L₂, is 0.05 m. P Water P-1.5 for For the overall process of the water, evaluate the work and heat transfer, each in kJ/kg. Kinetic and potential effects are negligible. 27

Referring to the figure shown below, water contained in a piston-cylinder assembly, initially at 1.5 bar and a quality of 40%, is heated at constant pressure until the piston hits the stops. Heating then continues until the water is saturated vapor. The initial height, L₁, is 0.05 m and the change in height, L₂, is 0.05 m. P Water P-1.5 for For the overall process of the water, evaluate the work and heat transfer, each in kJ/kg. Kinetic and potential effects are negligible. 27

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter4: The Second Law Of Thermodynamics

Section: Chapter Questions

Problem 50P: One mole of an ideal gas doubles its volume in a reversible isothermal expansion. (a) What is the...

See similar textbooks

Similar questions

It is unlikely that a process can be isothermal unless it is a very slow process. Explain why. Is the same true for isobaric and isochoric processes? Explain your answer.
A mole of an ideal gas at pressure 4.00 atm and temperature 298 K expands isothermally to double its volume. What is the work done by the gas?
When a gas expands isothermally, it does work. What is the source of energy needed to do this work?
One kilogram of helium in an insulated piston/cylinder at 47°C and 1000 kPa is expanded in a reversible process to 500 kPa, as shown in the above figure. Find a) the final temperature of helium gas and b) the final volume of helium gas. Helium is an ideal gas with constant specific heats. (for helium R-2.0769 kJ/kg-K, C.-5.1926 kJ/kg-K, c.-3.1156 kJ/kg-K).
A frictionless piston–cylinder device initially contains 200 L of saturated liquid refrigerant-134a. The piston is free to move, and its mass is such that it maintains a pressure of 900 kPa on the refrigerant. The refrigerant is now heated until its temperature rises to 70°C. Calculate the work done during this process.
014 10.0 points In each eyele of a Carnot engine, 124 J of heat is absorbed from the high-temperature reservoir and 61 Jis exhausted to the low- temperatire reservoir. What is the efficieney of the egine? 015 10.0 points The exhaust temperature of a Carmot heaT engine k 114C Wirat is theintake temperatme il the elfi- rieney of the mgne is 28,2%? Answer in initsof C.
The temperature of an ideal gas is raised from 298 K to 402 K in a process that increases the heat content of the gas by 1000 J. What is the = -R for the gas, and these are constant. Hint: It will be 2 work performed on the system by this process? Assume that c 'y helpful to evaluate AU for this process. 3 =-R and C R
14. Pressure P, volume Vand temperature T for a certain gas are related by P - T-BT". Where a and bare constants. Find the work done by the gas if the temperature changes from 7, to T, while the pressure remains the constant.
5 moles of an ideal gas are compressed to half the initial volume at a constant temperature of 27.0°C. Calculate the work done in the process. Given R 8.3 JK- mol-. Write your result up to appropriate significant figures.
The pV-diagram in Fig. shows a process abc involving0.450 mol of an ideal gas. (a) What was the temperature of this gasat points a, b, and c? (b) How much work was done by or on the gas inthis process? (c) How much heat had to be added during the process toincrease the internal energy of the gas by 15,000 J?
Example.3. A fan of di ameter 0.7m running at 1500r.p.m. delivers 140m /min of air at 15°C against 75mm of water of total pressure when its total efficiency is 86 percent. Determine the volume of air delivered, total pressure developed and horsepower consumed, if (a) the air temperature is 50°c, (b) the air temperature is 50°C and the fan speed is increased to 1700 r.p.m (c) the conditions are same as in (b) but a 0.6m di ameter, geometrically similar fan is used.
The graph inFig. shows a pV-diagramfor 3.25 mol of ideal helium (He)gas. Part ca of this process is isothermal.(a) Find the pressure of theHe at point a. (b) Find the temperatureof the He at points a, b, and c.(c) How much heat entered or leftthe He during segments ab, bc, andca? In each segment, did the heatenter or leave? (d) By how muchdid the internal energy of the He change from a to b, from b to c, andfrom c to a? Indicate whether this energy increased or decreased.