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Heat Energy Concepts

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Questions and Answers

What is heat?

A form of energy that flows between two bodies of the same temperature

A form of energy that flows between two bodies of different temperatures (correct)

A form of energy that only comes from mechanical sources

A form of energy that is colorless and odorless

Why do we feel hot when the Sun shines?

Due to the Sun emitting light energy

Because the Sun is very close to Earth

As a result of the Sun being a source of heat energy (correct)

Because the Sun emits radiation

How can other forms of energy be converted into heat?

By driving air molecules into a smaller space (correct)

By increasing the temperature of a system

Through the process of condensation

By converting electrical energy directly into heat energy

What does an increase in temperature of a system indicate?

An increase in the internal energy of the system (D) Signup and view all the answers

What happens when work is done on an object?

The object's temperature increases (D) Signup and view all the answers

What is the internal energy of a body related to?

The average activity of atoms and molecules in motion within the body (D) Signup and view all the answers

What happens to the heat of a body when the velocity of its molecules decreases?

The heat decreases (C) Signup and view all the answers

Which symbol is commonly used to indicate heat?

$\mathcal{Q}$ (A) Signup and view all the answers

According to the law of conservation of energy, what happens to energy?

Energy can change from one form to another (B) Signup and view all the answers

In Einstein's equation E=MC2, what principle combines the conservation of energy and matter?

Conservation of mass energy (C) Signup and view all the answers

What is the SI unit used to express heat?

Joule (B) Signup and view all the answers

How many calories are equivalent to 1 kilocalorie?

100 calories (E) Signup and view all the answers

What does the heat capacity of a substance indicate?

The amount of heat required to change its temperature (D) Signup and view all the answers

Which unit is used to express specific heat?

Calorie per gram per degree Celsius (C) Signup and view all the answers

What is the definition of specific heat of a substance?

The heat required to cause a temperature change in the same mass of water (C) Signup and view all the answers

Why can a large body of water moderate temperatures effectively?

Due to its high specific heat capacity (D) Signup and view all the answers

What is indicated by the symbol 'c' in the context of specific heat?

Specific heat of the substance (C) Signup and view all the answers

How does a large body of water affect the temperature of its surroundings?

By absorbing and releasing significant quantities of heat (B) Signup and view all the answers