Energy and Thermodynamics Exam Prep

Front

Identify the law of thermodynamics associated with the clue: The only way to reduce an object's temperature is to increase the entropy of the environment.

Back

second law of thermodynamics

Answer explanation

The second law of thermodynamics states that the total entropy of an isolated system can never decrease over time. To lower an object's temperature, heat must be transferred to the environment, increasing its entropy.

Front

Identify the law of thermodynamics associated with the following clue. Energy cannot be created or destroyed.

Back

first law of thermodynamics

Answer explanation

The first law of thermodynamics states that energy cannot be created or destroyed, only transformed. This principle directly aligns with the clue provided, confirming that the correct answer is the first law.

Front

Identify the law of thermodynamics associated with the following clue: Energy can flow from a colder object to a warmer object only if something does work.

Back

second law of thermodynamics

Answer explanation

The second law of thermodynamics states that energy naturally flows from hot to cold. However, for it to flow from a colder object to a warmer one, external work must be done, aligning with the clue provided.

Front

Identify the law of thermodynamics associated with the following clue: Absolute zero can never be achieved.

Back

third law of thermodynamics

Answer explanation

The third law of thermodynamics states that as temperature approaches absolute zero, the entropy of a perfect crystal approaches zero, indicating that absolute zero cannot be reached. This aligns with the clue provided.

Front

Identify the law of thermodynamics associated with the following clue. A change in a system's energy is equal to the energy transferred to the system.

Back

first law of thermodynamics

Answer explanation

The first law of thermodynamics states that the change in a system's energy is equal to the energy transferred to or from the system. This aligns with the clue provided, confirming it as the correct choice.

Front

Classify the following type of energy: solar energy. Options: renewable energy resource, nonrenewable energy resource.

Back

renewable energy resource

Answer explanation

Solar energy is derived from the sun and can be harnessed repeatedly without depleting resources, making it a renewable energy resource. Unlike nonrenewable resources, it is sustainable and environmentally friendly.

Front

Classify nuclear energy as a renewable or nonrenewable energy resource.

Back

nonrenewable energy resource

Answer explanation

Nuclear energy is derived from the fission of uranium or plutonium, which are finite resources. Once depleted, they cannot be replenished, making nuclear energy a nonrenewable energy resource.

Front

Classify hydroelectric energy as a renewable or nonrenewable energy resource.

Back

renewable energy resource

Answer explanation

Hydroelectric energy is generated from flowing water, which is a natural and replenishable resource. Therefore, it is classified as a renewable energy resource.

Front

Classify geothermal energy as a renewable or nonrenewable energy resource.

Back

renewable energy resource

Answer explanation

Geothermal energy is derived from the Earth's internal heat, which is continuously replenished. This makes it a renewable energy resource, as it can be used sustainably without depleting the source.

Front

Classify the following type of energy: fossil fuels. Options: renewable energy resource, nonrenewable energy resource.

Back

nonrenewable energy resource

Answer explanation

Fossil fuels, such as coal, oil, and natural gas, are formed from ancient organic matter and take millions of years to form. Once depleted, they cannot be replenished in a human timescale, making them a nonrenewable energy resource.