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Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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
Transcribed Image Text:After 6.00 kg of water at 88.4 °C is mixed in a perfect thermos with 3.00 kg of ice at 0.0 °C, the mixture is allowed to reach equilibrium.
When heat is added to or removed from a solid or liquid of mass m and specific heat capacity c, the change in entropy can be shown to
be AS = mc In(T+/T;), where T; and Tf are the initial and final Kelvin temperatures. Using this expression and the change in entropy for
melting, find the change in entropy that occurs.
Number
i
Units
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- 4. Choose the correct statement/s with respect to entropy change during a process a. Entropy increases with increase in pressure at constant temperatureb. Entropy increases with increase in temperature at constant pressurec. Entropy can be kept constant by systematically increase both pressure and temperatured. Entropy can not be changedarrow_forwardwater at 40 ° C is converted into superheated steam at 250 ° C at 150 kPa. Specify: a. Initial enthalpy of water (Singh's Book Tab A 4.2) = AnswerkJ / kg. b. Enthalpy at saturated vapor pressure = AnswerkJ / kg. c. Superheated vapor enthalpy (Tab A Singh's Book 4.3) = AnswerkJ / kg. d. Total enthalpy change = AnswerkJ / kg.arrow_forward1. Combustion gases enter the nozzle of a jet engine at 3.8 bar and 820°C. The nozzle is well insulated and the gases expand down to an exit pressure of 1.1 bar. Determine the temperature and the velocity of the gases at exit from the nozzle assuming the velocity at inlet is negligible. For the combustion gases take c, = 1.15 KJ/Kg. K and the ratio of specific heats = 1.32arrow_forward
- for steam, the specific ideal gas constant = 461.5 J/kg K A closed system is comprised of pure water substance initially at a temperature of 500 oC and a pressure of 20 MPa (state 1). The system undergoes an isochoric process whereby its pressure drops to 0.1 Mpa (state 2). Sketch the process on a Temperature-specific entropy plot, showing the lines of constant pressure which pass through steps 1 and 2.arrow_forwardUse image below Part A - Evaluate the volume and internal energy of the air in the initial state 1, in the intermediate state 2, and in the final dead state DS. Also evaluate the temperature of the air in the intermediate state 2. PArt B - Plot the processes 1 → 2 → DS on P–v, T–v, P–s, and T–s diagrams. Mark states 1, 2, and DS on the graphs, and make sure that it is clear when a given quantity increases, decreases, or remains constant.arrow_forward
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