3. A closed system of mass 10 kg undergoes a process during which there is energy transfer bywork from the system of 0.147 kJ per kg, an elevation decrease of 50 m, and an increase invelocity from 15 m/s to 30 m/s. The specific internal energy decreases by 5 kJ/kg and theacceleration of gravity is constant at 9.7 m/s2. Determine the heat transfer for theprocess,inkJ.

Given: Mass, m = 10 kg Work done by system, w = 0.147 kJ/kg Elevation, Δh = - 50m (negative because…

Answered: 3. A closed system of mass 10 kg…

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

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A closed system of mass of 2 kg undergoes a process during which there is energy transfer by work from the system of 75J, and the system velocity reduces from 10 m/s to 5 m/s. The specific internal energy decreases by 50 J/kg. Determine the heat transfer for the process, in J.
A system consisting of 3 lb of water vapor in a piston–cylinder assembly, initially at 350°F and a volume of 71.7 ft3, is expanded in a constant‐pressure process to a volume of 85.38 ft3. The system then is compressed isothermally to a final volume of 28.2 ft3. During the isothermal compression, energy transfer by work into the system is 72 Btu. Kinetic and potential energy effects are negligible. Determine the heat transfer, in Btu, for each process.
There is a piston-cylinder system that undergoes a process. The total work done by the system, W, is 50 kJ, and thechange in the specific internal energy of the system, Δu, is −7 kJ/kg. We also know the total mass of the system, m, is 10kg. During the process, both the change of kinetic energy and the change of potential energy are negligible. Pleasedetermine 1) the total energy change, ΔE, in kJ; 2) the total heat transfer, Q, in kJ; and 3) judge the direction of energyflow for the heat transfer: into the system or out of the system.
A closed, rigid tank contains 2 kg of water initially at 80°C and a quality of 0.6. Heat transfer occurs until the tank contains only saturated vapor. Kinetic and potential energy effects are negligible. For the water as the system, determine the amount of energy transfer by heat, in kJ.
Five lbs of propane is contained in a closed, rigid tank initially at 80 lbf/in.2, 90°F. Heat transfer occurs until the final temperature in the tank is 0°F. Kinetic and potential energy effects are negligible.Determine the amount of energy transfer by heat, in Btu.
A thermodynamics steady flow system receives 4.56 kg/min of a fluid where the pressure is 137.9 Kpa specific volume of 0.0388 m3/kg, velocity of 122m/s and internal energy of 1,160 Kj/Kg. the fluid leaves the system at a boundary where pressure is 551.6Kpa , specific volume of 0.193 m3/kg , velocity of 183 m/s and internal energy of 52.8 Kj/kg. during the passage through the system, the fluid receives 3,000 Joules/s of heat. Determine the steady flow work in. Kj/min and kj/s
A closed, rigid tank is filled with 0.02 lb of water, initially at 120°F and a quality of 50%. The water receives 8 Btu by heat transfer. Determine the temperature, in °F, pressure, in lbf/in.2, and quality of the water at its final state.
In the process where the product of pressure and the volume is constant, a gas compression is carried out from an intial pressure of 200 kPa to a final pressure of 800 kPa. Consisting that the initial specific volume is 0.10 m^3 /kg, determine the work done per kilogram of gas.
Four kilograms of carbon monoxide (CO) is contained in a rigid tank with a volume of 1 m3. The tank is fitted with a paddle wheel that transfers energy to the CO at a constant rate of 14 W for 1 hour. During the process, the specific internal energy of the carbon monoxide increases by 10 kJ/kg. If no overall changes in kinetic and potential energy occur, determine: a. the specific volume at the final state, in m3/kg b. the energy transfer by work, in kJ. c. the energy transfer by heat transfer, in kJ, and the direction of the heat transfer.
Water, initially a saturated liquid at 100°C, is contained in a piston-cylinderassembly. The water undergoes a process where it changes to the corresponding saturatedvapor state, during which the piston moves freely in the cylinder. If the change of state isbrought about by heating the water as it undergoes an internally reversible process atconstant pressure and temperature, determine the (a) work and (b) heat transfer per unitmass, each in kJ/kg.
An automobile having a mass of 1100 kg initially moves along a level highway at 110 km/h relative to the highway. It then climbs a hill whose crest is 40 m above the level highway and parks at a rest area located there. Use a reference with kinetic and potential energy each equal to zero for the stationary highway before the hill.Let g = 9.81 m/s2. For the automobile, determine its change in kinetic energy and its change in potential energy, both in kJ.
Heat in the amount of 7.5 kJ is added to a closed system while its internal energy decreases by 12 kJ. How much energy is transferred as work? For a process causing the same change of state but for which the work is zero, how much heat is transferred?

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