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Questions and Answers
A homebuilder is deciding between different heating systems for a new house. They want a system that is energy efficient and can distribute heat evenly throughout the house. Which two systems would be most appropriate?
A homebuilder is deciding between different heating systems for a new house. They want a system that is energy efficient and can distribute heat evenly throughout the house. Which two systems would be most appropriate?
- Solar and forced-air systems
- Electric and solar heating systems
- Forced-air and radiator systems (correct)
- Radiator and electric heating systems
A sealed container of gas is compressed rapidly. According to the first law of thermodynamics, what will be the most likely effect of this compression?
A sealed container of gas is compressed rapidly. According to the first law of thermodynamics, what will be the most likely effect of this compression?
- The thermal energy of the gas will increase due to the work done on it. (correct)
- The mechanical energy of the gas will increase proportionally to the compression.
- The mechanical energy of the gas will remain constant as the system is sealed.
- The thermal energy of the gas will decrease, and the container will cool down.
In a scenario where a perfectly insulated container has a gas that expands and performs work on its surroundings, what must happen according to the first law of thermodynamics?
In a scenario where a perfectly insulated container has a gas that expands and performs work on its surroundings, what must happen according to the first law of thermodynamics?
- The thermal energy of the gas increases, and the temperature rises.
- The temperature of the gas remains constant because the container is insulated.
- The thermal energy of the gas decreases, and the temperature drops. (correct)
- The mechanical energy of the gas increases to balance the change.
A car engine converts chemical energy into mechanical energy and heat. Considering the principles of thermodynamics, which statement accurately describes this process?
A car engine converts chemical energy into mechanical energy and heat. Considering the principles of thermodynamics, which statement accurately describes this process?
A student is designing an experiment to demonstrate the first law of thermodynamics. They use a sealed container with a piston. Which action would best illustrate the conversion of work into thermal energy?
A student is designing an experiment to demonstrate the first law of thermodynamics. They use a sealed container with a piston. Which action would best illustrate the conversion of work into thermal energy?
Flashcards
Mechanical Energy
Mechanical Energy
The sum of potential and kinetic energy in a system.
Forced Air System
Forced Air System
A heating system that heats air in a furnace and blows it through ducts.
Heating System Types
Heating System Types
Radiator, electric, and solar systems. They all heat differently.
Thermodynamics
Thermodynamics
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First Law of Thermodynamics
First Law of Thermodynamics
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Study Notes
- Mechanical energy is the sum of the potential energy and the kinetic energy in a system of objects.
Heating Systems
- Forced-air systems are the most common type of heating used in the United States.
- In forced-air systems, air heated by the furnace gets blown through ducts that usually lead to every room.
Other Types of Heating Systems
- Radiator systems
- Electric heating systems
- Solar heating systems
Thermodynamics
- Thermal energy, heat, and work are related.
- Thermodynamics is the study of the relationships between thermal energy, heat, and work.
- The first law of thermodynamics states that if the mechanical energy of a system is constant, the increase in thermal energy transfers into that system and the work done on that system.
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Description
Mechanical energy defined as the sum of potential and kinetic energy. Forced-air systems are the most common heating type. Thermodynamics studies the relationship between thermal energy, heat, and work.
