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What is the first law of thermodynamics?

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Question: What is the first law of thermodynamics?

Options:

  1. Energy cannot be created or destroyed
  2. Entropy of an isolated system always increases
  3. Heat cannot spontaneously flow from a colder body to a hotter body
  4. The total energy of a system is constant

Correct Answer: Energy cannot be created or destroyed

Solution: 

The first law of thermodynamics states that energy cannot be created or destroyed, only transformed from one form to another.

What is the first law of thermodynamics?

Practice Questions

Q1
What is the first law of thermodynamics?
  1. Energy cannot be created or destroyed
  2. Entropy of an isolated system always increases
  3. Heat cannot spontaneously flow from a colder body to a hotter body
  4. The total energy of a system is constant

Questions & Step-by-Step Solutions

What is the first law of thermodynamics?
  • Step 1: Understand that energy is a property that can exist in different forms, like heat, light, or motion.
  • Step 2: Learn that the first law of thermodynamics is also known as the law of energy conservation.
  • Step 3: Realize that this law means energy cannot just appear or disappear.
  • Step 4: Know that energy can only change from one form to another, like turning chemical energy in food into kinetic energy when you move.
  • Step 5: Remember that the total amount of energy in a closed system remains constant, even if it changes forms.
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