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?

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

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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Concept explainers

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.

Question

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?

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