18 Questions
According to the First Law of Thermodynamics, what is the relationship between the net heat supplied to a system and the net work done by the system?
The net heat supplied to the system is equal to the net work done by the system.
What was the historical view of heat before Joule's experiments in the 1840s?
Heat was considered to be a fluid known as 'caloric'.
In the steam plant problem, what is the relationship between the specific heat supplied to the steam in the boiler ($q_{in}$) and the specific heat rejected by the system in the condenser ($q_{out}$)?
$q_{in} > q_{out}$
What is the purpose of the feed pump in the steam plant problem?
To pump the condensate water back into the boiler.
What is the unit for the steam flow rate $m$ calculated in the steam plant problem?
kg/s
What is the significance of the system boundary shown in the diagram of the steam plant?
It defines the region where the First Law of Thermodynamics is applied.
What is the equation used to apply the first law of thermodynamics in this problem?
ΣdQ = ΣdW
What is the net heat flow (Σdq) in the cycle according to the text?
700 kJ/kg
What does the non-flow equation state about a system undergoing a cycle?
Net heat supplied equals net work output for a complete cycle
What does it indicate about the system if the final intrinsic energy is higher than the initial value?
Difference between net heat and net work increased system's intrinsic energy
What is the steam mass flow rate in kg/s according to the calculations provided?
1.421 kg/s
Which equation is used to relate the steam mass flow rate to the net work output in the problem?
mṁ(700) = 995
What is the First Law of Thermodynamics a statement of?
The principle of conservation of energy
If a system undergoes a complete thermodynamic cycle and net work is done by the system, where does the mechanical energy come from?
It comes from the heat supplied to the system
If a system undergoes a complete thermodynamic cycle and net work is done on the system, what is true about the heat and work involved?
The net work done on the system is equal to the net heat supplied
If a system undergoes a complete thermodynamic cycle and returns to its initial state, what can be said about its intrinsic energy?
It must be unchanged
In a thermodynamic cycle, if the net work done by the system is positive, what can be said about the net heat supplied to the system?
It must be positive
According to the First Law of Thermodynamics, which of the following statements is true?
Energy can be neither created nor destroyed
Learn about the concept of energy and the Principle of the Conservation of Energy as developed by scientists in the nineteenth century. Understand the relationship between heat energy, mechanical energy [i.e. work], and the First Law of Thermodynamics.
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