4. A 10 Ibm is drop on a 5 kgm piston with a face area of 800 cm? causingthe cylinder to decrease in volume and produced a 2KW of Work with4kgs/hr of gas exiting the fan and heat deflection of 0.5 KJ/Kg. Considerthat the atmospheric pressure is 100 KPa, determine the change ininternal energy, in KJ/Kg. Neglect the friction between the piston and thecylinder surface.10 Ibm0.5 m0.3mWFan

Given: To find: Change in internal energy

Answered: 4. A 10 lbm is drop on a 5 kgm piston…

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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Why do we use enthalpy in place of Internal Energy In the energy Balance for open systems?
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. 4) 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 constant
A closed system undergoes a frictionless process from 200 psia and 3 ft during which theproduct pV1.3 remains constant. How much work does the system do if the final pressure is 40 psia?
20 kg of water at 25°C is contains in a rigid tank that fitted with a stirrer which delivers work to the water at the rate of 0.5 kW. How long does it take for the temperature of the water to rise to 35°C if no heat is lost from the water? For water, Cp = 4.184 kJ/kg K *
Five kilograms of neon in a constant volume system. The neon is initially at 550 kPa and 350 K. Its pressure is increased to 2000 kPa by a paddle work with 210 kJ of heat added. Find: (a) the nonflow work in kJ 0 -2854.9 -2644.9 (b) the change in internal energy in kJ 1712.9 2584.9 2854.9
3. Air with a pressure of 2 MPa and a temperature of 250 C (0.5 kg of PV^ 1.25 = expands while satisfying a certain relationship. Find the work done during this process when it expands until the temperature reaches 330 K.
A pump handling a liquid raises its pressure from 1 bar to 30 bar. Take the density of the liquid as 990 kg /m*. The isentropic specific work done by the pump in kJ/kg is
2. 1 kg water at velocity 12.5 m/s and 30oC enters a 2.54 cm diameter horizontal pipe where there is no heat or work exchange with the surroundings. The water suddenly flows through a larger pipe with a diameter of 3.85cm. Calculate the following: a. Velocity of the water leaving the pipe in m/s b. The change in temperature of the water. Cpwater=4.18 KI Kg.K
A fluid enters a machine at 172.1 m/s, 874.56kPa, and with a specific volume of 0.368 m3/kg. The radiation heat loss is 21.1 kJ/kg. The radiation heat loss is 21.1 kJ/kg. The internal energy decreases 480 kJ/kg. If the fluid leaves 253.03 m/s, 123.27 kPa, and 0.807 m3/kg. Determine the work done in kJ by the fluid if its mass is 1.4 kg.
Nitrogen gas at 90° F (MW=28) goes through a compressor, increasing its pressure from 10 psi to 65 psi. The temperature remained constant throughout. Determine the work in Hp for a steady flow process; ΔKE=0, ΔPE=0; mass flow rate of nitrogen is 2 lbm/min. Round up to 4 decimal places. Draw and label the P-V and T-S diagrams.
A gas is contained in a 0.5 m3 rigid tank. The gas receives a paddle work of 5.5W for 30 mins. At initial state, the density of the gas is 1.8 Kg/m3. Determine the change in specific internal energy in KJ/Kg.
a closed system undergoes a frictionless process from 200psia and 3ft^3 during which the product pV^1.3 remains constant. how much work does the system do if the final pressure is 40psia

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