Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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- An elastic balloon behaves such that pressure is proportional to diameter and the balloon contains 0.5 kg air at 200 kPa and 300 The balloon is momentarily connected to an air line at 500 kPa and 1000C. Air is let in until the volume doubles, during which process there is a heat transfer of 50 kJ out of the balloon. Find the final temperature and the mass of air that enters the balloon.
- After that the air line is disconnected from the balloon and the air is allowed to escape through an opening until the same initial pressure and temperature. For this process, the balloon behaves such that pressure is proportional to squire of diameter. Determine the final mass in the balloon and heat transfer during this process.
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- A 100L tank initially contains water at 100kPa and a quality of 1%. Heat is transferred to the water, raising the temperature and pressure. At a pressure of 3 MPa, a safety valve opens and saturated vapor at 3 MPa flows out. The process continues, maintaining 3 MPa inside until the quality in the tank is 90% and then stops. Determine the total mass of water that flowed out and the total heat transfer.arrow_forwardAn ideal gas is compressed from a volume of V, = 6.00 L to a volume of V, = 3.00 L while in thermal contact with a heat reservoir at T = 295 K as in the figure below. During the compression process, the piston moves down a distance of d = 0.145 m under the action of an average external force of F = 21.0 kN. (a) Find the work done on the gas. kJ (b) Find the change in internal energy of the gas. k) (c) Find the thermal energy exchanged between the gas and the reservoir. kJ (d) If the gas is thermally insulated so no thermal energy could be exchanged, what would happen to the temperature of the gas during the compression? O The temperature would decrease. O The temperature would remain constant. O The temperature would increase.arrow_forwardAn adiabatic vessel has a valve that allows some water to be released. Initially it has 500 Kg of saturated liquid wate at a temperature of 50°C. Find the following: The temperature of remaining water if 10 Kg of water vapor escapes through the valve. If the remaining water is at 20°C, find the amount of water escaped as vapor. Assume specific heat of water, C = 4 Kj/Kg-K and Enthalpy of vaporization of water, AHvap 2400 Kj/Kgarrow_forward
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