Example 2.5 Consider a gas contained in a piston-cylinder assembly as the system. The gas is initially at a pressure of 1000 kPa and occupies a volume of 0.1 m". The gas is taken to the final state where pressure is equal to 200 kPa, by the following two different processes. (i) The volume of the gas inversely proportional to the pressure. (i) The process follows the path =constant, where n =1.4. Calculate the work done by the gas in each case.

Example 2.5 Consider a gas contained in a piston-cylinder assembly as the system. The gas is initially at a pressure of 1000 kPa and occupies a volume of 0.1 m". The gas is taken to the final state where pressure is equal to 200 kPa, by the following two different processes. (i) The volume of the gas inversely proportional to the pressure. (i) The process follows the path =constant, where n =1.4. Calculate the work done by the gas in each case.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

39 - A fixed volume insulated tank, which was initially empty, was connected by a valve to a distribution line carrying helium gas at a temperature of 125ºC. The valve is opened first and closed when the pressure is the same as the distribution line pressure. What is the final internal energy of helium in the tank? (Internal energy of the warehouse in the final state = Enthalpy of the distribution line). (Cp=5.1926) will be taken. a) 2066.7 kJ/kg B) 2014.7 kJ/kg NS) 701.0 kJ/kg D) 649.1 kJ/kg TO) 2118.6 kJ/kg
Correct Solution Fast. 25 kg of water, initially at 40 ° C and 1 bar, occupying 0.06 m3 undergoes a process in which it attains a final state of 100 ° C and 300 bar. Assume that under these conditions the water can be treated as an incompressible fluid with specific heat, c(T) = 0.003 kJ/kg.K^2 + 7.38 kJ/kgK. Determine Delta H in KJ.
32 - A fixed volume insulated tank, initially empty, was connected to a distribution line carrying helium gas at 115ºC by means of a valve. The valve is opened first and closed when the pressure is the same as the distribution line pressure. What is the final internal energy of helium in the tank? (Internal energy of the warehouse in the final state = Enthalpy of the distribution line). (Cp=5.1926) will be taken. a) 2014.7 kJ/kg B) 649.1 kJ/kg NS) 2118.6 kJ/kg D) 2066.7 kJ/kg TO) 597.1 kJ/kg
solve the following problem: Steam enters a turbine operating at steady state at 850oF and 450 lbf/in2 and leaves as a saturated vapor at 1.4 lbf/in2. The turbine develops 12,000 hp, and heat transfer from the turbine to the surroundings occurs at a rate of 2 x 106 Btu/h. Neglect kinetic and potential energy changes from inlet to exit. Determine the exit temperature, in oF, and the volumetric flow rate of the steam at the inlet, in ft3/s.
A condenser of a thermal power plant operates as a surface heat exchanger, 10,000 kg / h of water vapor enters at 0.5 bar and with a quality of 0.95 and the condensate leaves as a saturated liquid at the same pressure. The cooling water enters the condenser as a separate stream at 1 bar and 20 ° C and exits at 35 ° C without pressure change, assuming steady state operation, determine: a) The temperature of the condensed steam b) The amount of cooling water required in m3 / s c) The heat energy transmitted by the steam to the cooling water in Kw
A closed, rigid tank with a volume of 0.6m ^ 3 contans saturated water vapor at900 kPa the nital stale The tar pressures decreased to 300 kPa through heat exchange with the surroundings Question 1 to apply to Problem 1 What is the initial specific volume v, m^ 3 kg ?
Propane is contained in a closed, rigid container with a volume of 10 m^3. Initially the pressure and temperture of the propane are 8 bar and 80 ^0C, respectively. The temperture drops as a result of energy rejected by heat transfer to the surroundings. Determine the temperture at which condensation first occurs, in ^0C, and the fraction of the total mass that has condensed when the pressure reaches 5 bar. What is the volume, in m^3, occupied by saturated liquid at the final state?
A fluid at X bar of 0,733 occupying 0.09m^3 is compressed reversibly to a pressure of Y bar of 11 and a specific volume of Z=0.55m^3/kg according to the law of Pv^n=c. The fluid then expands reversibly according to the law Pv^2=c to the value A bar of 2,2.A reversible cooling at constant volume then restores the fluid back to initial state. Calculate (a) mass of the fluid present;(b) the value of n in the process ;(c) the network of the cycle and (d) Sketch the P-v diagram for the cycle.
Pls ASAP thanks in advance Question 1 This question requires the use of the Thermodynamic Property Tables supplied as additional material. A closed system comprises a rigid (non-deformable) vessel of volume 0.3 m3 containing 5 kg of pure water substance, initially at a pressure of 30 bar (state 1). (a) For state 1, show that the system is in the two phase region The system now undergoes an isochoric (constant volume) process during which its pressure increases to 70 bar (state 2). (b) For state 2 show that the system is now in the superheated region. (c) Sketch the process described above on a pressure v specific volume diagram. Include in your sketch the boundaries between the liquid, two phase and vapour regions, and the critical pressure.
This question requires the use of the Thermodynamic Property Tables supplied as additional material.In addition, for steam, the specific ideal gas constant = 461.5 J/kg KA closed system is comprised of pure water substance initially at a temperature of 500 C and a pressure of 20 MPa (state 1).The system undergoes an isochoric process whereby its pressure drops to 0.1 Mpa (state 2).(a) Evaluate the specific entropy and specific volume of the system at state 1.(b) Evaluate the specific entropy, specific volume and temperature of the system at state 2.(c) Sketch the process on a Temperature-specific entropy plot, showing the lines of constant pressure which pass through steps 1 and 2.(d) For state 1 evaluate the specific volume assuming the steam behaves as an ideal gas and comment on your result.
Entropy is one of the important coordinates in thermodynamics. Entropy shows the ratio of heat absorbed or rejected by temperature so that it can indicate the direction of heat flow. Entropy is useful for knowing the internal energy efficiency. Derive an equation for the change in the internal energy of a gas that satisfies the van der Waals equation of state. Assume the value of Cv satisfies the relationship: Cv=c1 + c2T, with c1 and c2 constant
Use the following conversions where necessary:1hp = 745.7W; ρwater = 1000 kg/m3; ρmercury = 13600 kg/m3; 1 atm = 101.325 kPa; Cp (water) = 4.18 kJ/kg °C; g = 9.81m/s2; For properties of air, use R = 0.287 kJ/kg K; Cv (air) = 0.718 kJ/kg K; Cp (air) =1.005 kJ/kg K air enters a pipe at 25 °C, 100 kPa with a volumetric flow rate of 23 m3/h. On the outer pipe surface is an electrical resistor covered with insulation. With a voltage of 120 V, the resistor draws a current of 4 amps. Assuming the ideal gas model with cp = 1.005 kJ/kg - K for air and ignoring kinetic and potential energy effects, determine i. the mass flow rate of the air, in kg/h ii. the temperature of the air at the exit, in °C