Understanding the First Law of Thermodynamics - High School Physics

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Question

A gas in a closed container is heated with of energy, causing the lid of the container to rise with of force. What is the total change in energy of the system?

Answer

For this problem, use the first law of thermodynamics. The change in energy equals the increase in heat energy minus the work done.

We are not given a value for work, but we can solve for it using the force and distance. Work is the product of force and displacement.

Now that we have the value of work done and the value for heat added, we can solve for the total change in energy.

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Question

A gas in a closed container is heated, causing the lid of the container to rise. The gas performs of work to raise the lid, such that is has a final total energy of . How much heat energy was added to the system?

Answer

For this problem, use the first law of thermodynamics. The change in energy equals the increase in heat energy minus the work done.

We are given the amount of work done by the gas and the total energy of the system. Using these values, we can solve for the heat added.

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Question

A gas in a closed container is heated with of energy, causing the lid of the container to rise. If the change in energy of the system is , how much work was done by the system?

Answer

For this problem, use the first law of thermodynamics. The change in energy equals the increase in heat energy minus the work done.

We are given the total change in energy and the original amount of heat added. Using these values, we can solve for the work done by the system.

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Question

Which of the following represents the first law of thermodynamics?

Answer

The first law of thermodynamics is another wording of the law of conservation of energy. Effectively it states that energy cannot be created or destroyed, but it can change forms.

This means that, in the given situation of the ball rolling down the hill, the total initial energy equals the final kinetic energy plus heat.

The zeroth law of thermodynamics states that if a system is in equilibrium with two other systems, then the two other systems are in equilibrium with each other.

The second law of thermodynamics states that the entropy of a closed system will always increase.

The third law of thermodynamics states that absolute zero is the temperature at which entropy is zero.

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Question

According to the first law of thermodynamics, in an isothermal process __________.

Answer

According to the first law of thermodynamics, change in internal energy of a closed system is given by the difference between the heat energy added to the system and the work done by the system:

In an isothermal process, temperature is constant. Temperature is a measure of internal energy of the system. If temperature is constant, then there is no fluctuation of internal energy.

It can be implied that heat added to the system is equal to work done by the system.

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