A pressure cooker containing some water with an internal energy of 300 kJ is heated by a gas burner. 0.5 kg of steam with an enthalpy of 1800 kJ/kg escapes through the safety valve. The heat loss through the wall of the cooker is 250 kJ. If the final internal energy of the water and steam in the cooker is 500 BTU. Find the heat supplied to the coo

A pressure cooker containing some water with an internal energy of 300 kJ is heated by a gas burner. 0.5 kg of steam with an enthalpy of 1800 kJ/kg escapes through the safety valve. The heat loss through the wall of the cooker is 250 kJ. If the final internal energy of the water and steam in the cooker is 500 BTU. Find the heat supplied to the coo

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

Calculate the amount of heat which enters or leaves 1kg of steam initially at 0.5MPa and250OC, when it undergoes the following processes: a. It is confined by a piston in a cylinder and is compressed to 1MPa and 300OCas the piston does 200 kJ of work on the steam.b. It passes in steady flow through a device and leaves at 1MPa and 300OCwhile, per kg of steam flowing through it, a shaft puts in 200 kJ of work. Nochanges in KE and PE.c. It flows into an evacuated rigid container from a large source which ismaintained at the initial condition of the steam. Then 200 kJ of shaft work istransferred to the steam, so that its final condition is 1MPa and 300OC.
Calculate the work (in kJ) when substance initially at 218 kPa, 9 m³ is expanded to 61 kPa in a process where PV = Const.
Two rigid tanks A and B are connected by a valve. Tank A contains 0.6 of water at 550 kPa and 43 percent quality. Tank B contains 0.81 of water at 200 kPa and 700 oC. The valve is now opened and the two tanks eventually come to the same state and reach thermal equilibrium with the surroundings at 35 oC. Calculate the followings: a) The final pressure in the system (kPa); b) the amount of heat transfer (kJ). Submit your solution by adding (a) + (b) = View solution Format answer : 8599.6782
A piston-cylinder device initially contains CO2 at 200 kPa and 400°C and the total enclosed volume is 300 litres. Due to heat loss, the piston moves downwards to a position where it sits on a pair of stoppers and its final enclosed volume is 150 litres. Further heat loss leads to the pressure being reduced to 160kPa. Workout 1) the final temperature, 2) the total work done by CO2 and 3) the total heat transferred to CO2. Also make some comments on the result of heat and create a schematic p-v diagram of the process. The following assumptions are to be made: CO2 is a perfect gas and its molecular mass is 44kg/kmol. The ratio of specific heat capacities, γ (gamma) is 1.3 The volume occupied by the stoppers is to be ignored. There is no leakage in the system There is no friction between the cylinder and piston walls and the piston moved slowly at the same speed therefore, no acceleration. For the conversion from Celsius to Kelvin, use 273 Use 8314.5 J/kmol.K for the universal gas…
If 200 J of heat is released by a reservoir at 373 K and absorbed by a second reservoir at 273 K, how much work capability is “lost” in this process? 200 J - 200 J 400 J 0
2. If a gas of volume 6000 cm³ and at pressure of 100 kPa is compressed quasistatically according to PV? = constant until the volume becomes 2000 cm³, determine the final pressure and the work transfer.
A cylinder-piston apparatus contains 29 kg of air at 30°C. Weights on the piston fix the initial pressure at 20 bar. Find the work done if: a. Some of the weights are quickly removed until external pressure is 5 bar. The temperature remains constant. b. Some of the weights are slowly removed until the external pressure reaches 5 bar. The temperature remains constant. c. The expansion from 20 bar to 5 bar is polytropic, with an exponent of 1.4. Note that if the gas is ideal and PV = constant, then the temperature varies as: T₂ Tv 1-n P. n-1
A fluid at 700 kPa, with a specific volume of 0.25 m³/kg and a velocity of 175 m/s, enters a device. Heat loss from the device by radiation is 23 kJ /kg. The work done by the fluid is 465 kJ /kg. The fluid exists at 136 kPa, 0.94 m³/kg, and 335 m/s. Find the change in internal energy, in kJ/s.
3 Filling an air tank A well-insulated air storage tank initially contains 0.03 kg of air at 320 K and 130 kPa. The tank is connected to a valve in order to charge the tank, as shown in Fig. 2. The valve is opened, allowing supply air at 2 MPa and 680 K to enter the tank. When the pressure of the air in the tank has reached 500 kPa, the valve is closed. Take C₂ = 1.005 kJ/kgK, C₂: 0.718 kJ/kgK, Te = 132 K, and P = 3.77 MPa. = (a) (b) (c) In this problem, we will assume air behaves like an ideal gas. Justify this under the specified conditions. Assuming constant specific heat capacities, find the final temperature of the air in the tank. Hence, calculate the entropy generated by this process by assuming constant specific heat capacities. Pline Tline = 2 MPa : 680 K = Valve m₁=0.03 kg air T₁ = 320 K P₁ = 130 kPa Pfinal = = 500 kPa
Steam is operating a turbine. The mass flow rate of steam is 1.5 kg/s. The steam is entering at 2 MPa, 350C and is leaving at 0.1 MPa with a quality of 100%. During this process, 5 kW of heat is lost by the turbine. Determine the work produce by the turbine.