Problem The enthalpy of a system is given by the equation H = U + PV where U is the internal energy, P = pressure, and V = volume. In addition, the internal energy, U = Q + W where Q is the heat and W is the work. Suppose we want to find the rate of change in the enthalpy at constant pressure of 1.25 atm, what is the value when heat is absorbed by the system at a rate of 45 J/s and work is done by the system at a rate of 100 J/s when the change of volume is rated at 35 x 10 m%s? 1. What is the change in heat with respect to time? 2. What is the change in internal energy of the system with respect to time? 3. What is the change in enthalpy of the system with respect to time?

Elements Of Electromagnetics
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ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Problem 1:
A general equation is given to determine the dependent variable S: S = KT – TL + T² + 1002. K is expressed as K =
1/(T – 1) + k where k is a constant. L is expressed as L= In(m) – T3, where m is a constant. In addition,
In(m) – k = 0.
1. At what value/s of S will you be able to obtain a real-valued maximum or minimum?
2. What is/are the correct expression/s of the probable value/s of the maximum(ma)/minimum(ma) of S?
3. Suppose K and L are constants, together with the existing constants, what is the correct expression of S for the
maximum/minimum value?
Transcribed Image Text:Problem 1: A general equation is given to determine the dependent variable S: S = KT – TL + T² + 1002. K is expressed as K = 1/(T – 1) + k where k is a constant. L is expressed as L= In(m) – T3, where m is a constant. In addition, In(m) – k = 0. 1. At what value/s of S will you be able to obtain a real-valued maximum or minimum? 2. What is/are the correct expression/s of the probable value/s of the maximum(ma)/minimum(ma) of S? 3. Suppose K and L are constants, together with the existing constants, what is the correct expression of S for the maximum/minimum value?
Problem 2:
The enthalpy of a system is given by the equation H = U + PV where U is the internal energy, P = pressure, and V = volume.
In addition, the internal energy, U = Q + W where Q is the heat and W is the work. Suppose we want to find the rate of
change in the enthalpy at constant pressure of 1.25 atm, what is the value when heat is absorbed by the system at a rate
of 45 J/s and work is done by the system at a rate of 100 J/s when the change of volume is rated at 35 x 105 m/s?
1. What is the change in heat with respect to time?
2. What is the change in internal energy of the system with respect to time?
3. What is the change in enthalpy of the system with respect to time?
Transcribed Image Text:Problem 2: The enthalpy of a system is given by the equation H = U + PV where U is the internal energy, P = pressure, and V = volume. In addition, the internal energy, U = Q + W where Q is the heat and W is the work. Suppose we want to find the rate of change in the enthalpy at constant pressure of 1.25 atm, what is the value when heat is absorbed by the system at a rate of 45 J/s and work is done by the system at a rate of 100 J/s when the change of volume is rated at 35 x 105 m/s? 1. What is the change in heat with respect to time? 2. What is the change in internal energy of the system with respect to time? 3. What is the change in enthalpy of the system with respect to time?
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