What is the change in internal energy if 10 J of heat is given to system at constant pressure and 20 J of work is done by the system? The answer is
-10 J.
What is the change in internal energy of a system if 20J of heat?
Internal energy of system is
decreased by 80 Joules
.
What is the change in internal energy if 1kj of heat is released from the system and 4 kg of work is done on the system?
Work is done on the system, hence work done will be +4 kj. Heat is released from the system hence Q will be -1 kj. ∆U =
3 kj
. Hence, change in internal energy is 3 kj.
What is the change in internal energy U for a system that does 70 J of work as it absorbs 45 J of heat?
According to First Law of Thermodynamics, ⇒ Internal energy (ΔU)= q+W =
(-45)+70 = -25 J
.
What is the change in the internal energy of a system if 15 J of work are done on the system and 6 J of heat are removed from the system?
Two different processes produce the same change in a system. (a) A total of 15.00 J of heat transfer occurs into the system, while work takes out a total of 6.00 J. The change in internal energy is
ΔU=Q−W=9.00 J.
What will be the change in internal energy when 12kj of work is done on the system and 2kj of heat is given by the system?
It does not depend on the path but only on the state of the system and hence it is a state function. Hence, the change in internal energy is
+10kJ
.
Which equation is correct for adiabatic process?
For such an adiabatic process, the modulus of elasticity (Young’s modulus) can be expressed as
E = γP
, where γ is the ratio of specific heats at constant pressure and at constant volume (γ = C
p
C
v
) and P is the pressure of the gas.
What is the change in internal energy of a system if the system?
The change in the internal energy of a system is
the sum of the heat transferred and the work done
. The heat flow is equal to the change in the internal energy of the system plus the PV work done.
What is the change in internal energy of the system if 20 J of heat is supplied?
Internal energy of system is
decreased by 80 Joules
.
Which of the following is a path function?
Two important examples of a path function are
heat and work
. These two functions are dependent on how the thermodynamic system changes from the initial state to final state. These two functions are introduced by the equation ΔU which represents the change in the internal energy of a system.
Which of the following is not included in internal energy?
thus internal energy does not include energy
due to gravitational pull
.
What can you say about the internal energy of a system if it absorbs heat and has work done on it?
Does adding heat to a system always increase its internal energy? If more work is done on the system than heat added,
the internal energy of the system will actually decrease
.
What happens to the internal energy of a system when work is done on it?
When a system does work on the surroundings, the system’s internal energy decreases. When a system has work done on it, the internal energy of
the system increases
. Like heat, the energy change from work always occurs as part of a process: a system can do work, but doesn’t contain work.
The relationship between the internal energy of a system and its heat and work exchange with the surroundings is:
E = q + w
(The form of work will be restricted to gaseous, PV-type for this discussion.)
What increases the internal energy of a system?
When a closed system receives energy as heat
, this energy increases the internal energy. It is distributed between microscopic kinetic and microscopic potential energies. In general, thermodynamics does not trace this distribution.
Is heat and internal energy the same?
Internal energy is a measure of the amount of kinetic and potential energy possessed by particles in a body and is measured in Joules. Heat energy on the other hand only concerns transfer of internal energy from a hotter body to a colder body.
