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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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5. Answer the questions about the conditions of the given phase change material. (1) In refrigerant R134a, calculate the temperature and enthalpy h (kJ/kg) at a pressure of 1 MPa and a specific volume of 0.01474 m^ 3 /kg. (2) In refrigerant R134a, calculate the pressure and enthalpy (kJ/kg) at -20℃ and a specific volume of 0.1 m^ 3 /kg. (3) In a 0.1m^3 volume container, there is water with a pressure of 1 MPa and a temperature of 250℃. Find the mass of water (kg). (4) At a pressure of 0.4 MPa, 2 kg of water is contained in a 0.4 m^3 container. Find the temperature in the container and the internal negative energy (kj/kg). (5) A container with a volume of 3 m^3 contains 5 kg of water with a pressure of 200 kPa. Find the temperature and internal energy (kJ/kg). (6) 41.3g of water is contained in an 80ℓ container. When the temperature is 150 °C, find the pressure (MPa). Note: The meaning of'water' above can be either liquid, water vapor, or a mixture of liquid and water vapor.> Enthalpy and internal energy are next to the specific volume in the table. Show P-v diagram or T-v diagram and indicate the corresponding status-6 diagrams

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