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Questions and Answers
Work is defined as a force acting through a displacement x perpendicular to the force.
Work is defined as a force acting through a displacement x perpendicular to the force.
False (B)
Work done by a system is always negative (-).
Work done by a system is always negative (-).
False (B)
The formula for work, W = F x d, can be expressed in N-m or Joules.
The formula for work, W = F x d, can be expressed in N-m or Joules.
True (A)
In a quasi-equilibrium process, the deviation from thermodynamic equilibrium is significant.
In a quasi-equilibrium process, the deviation from thermodynamic equilibrium is significant.
A closed system allows for mass flow across its boundaries.
A closed system allows for mass flow across its boundaries.
An open system involves a flow of energy.
An open system involves a flow of energy.
In the given scenario, the pressure in the cylinder is a function of volume represented as p=C/V.
In the given scenario, the pressure in the cylinder is a function of volume represented as p=C/V.
The latent vaporization process involves turning a gas into a liquid.
The latent vaporization process involves turning a gas into a liquid.
The heat transfer per unit mass of the system is represented by q=Q/m.
The heat transfer per unit mass of the system is represented by q=Q/m.
The work done by the system is found to be negative in the given problem.
The work done by the system is found to be negative in the given problem.
The specific enthalpy is calculated using the formula h = u + pv.
The specific enthalpy is calculated using the formula h = u + pv.
The final pressure in the cylinder is 200 KPa according to the scenario.
The final pressure in the cylinder is 200 KPa according to the scenario.
The First Law of Thermodynamics states that energy can be created but not destroyed.
The First Law of Thermodynamics states that energy can be created but not destroyed.
In a closed system, the energy entering the system is equal to the change of energy within the system plus the energy leaving the system.
In a closed system, the energy entering the system is equal to the change of energy within the system plus the energy leaving the system.
For a Single Stream, Single Flow (SSSF) process, the energy entering the system is not equal to the energy leaving the system.
For a Single Stream, Single Flow (SSSF) process, the energy entering the system is not equal to the energy leaving the system.
If Ein = ΔE + Eout and min = Δm + mout, then the system is closed and the working substance undergoes a steady-state process.
If Ein = ΔE + Eout and min = Δm + mout, then the system is closed and the working substance undergoes a steady-state process.
In the absence of any work interaction between a closed system and the surroundings, the heat transfer is equal to the total work of the closed system.
In the absence of any work interaction between a closed system and the surroundings, the heat transfer is equal to the total work of the closed system.
Processes in a closed system are referred to as non-flow processes.
Processes in a closed system are referred to as non-flow processes.
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Study Notes
Work
- Work is defined as a force acting through a displacement perpendicular to the force.
- The formula for work: W = F x d, measured in N-m or Joules.
- Work done by a system is always negative (-).
Thermodynamic Systems
- Closed system: Allows mass flow across its boundaries.
- Open system: Involves a flow of energy.
Quasi-Equilibrium Process
- Deviation from thermodynamic equilibrium is significant.
Thermodynamics
- First Law of Thermodynamics: Energy can be converted but not destroyed.
- For a closed system: Energy entering the system = change in energy within the system + energy leaving the system.
- Single Stream, Single Flow (SSSF) process: Energy entering the system ≠energy leaving the system.
- A closed system undergoing a steady-state process: Ein = ΔE + Eout and min = Δm + mout.
- Closed system without work interaction with surroundings: Heat transfer = total work of the system.
- Processes in a closed system are called non-flow processes.
Specific Enthalpy
- Formula: h = u + pv
Scenario
- Pressure in the cylinder: p=C/V
- Latent vaporization process: turning a gas into a liquid.
- Heat transfer per unit mass: q=Q/m
- Work done by the system: Negative.
- Final pressure in the cylinder: 200 KPa.
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