Introduction to Physical Science: Heat Capacity

The lecture introduces the concept of heat as a form of energy, measured in joules and calories. It explains the equivalence of heat and energy through Joule's experiment and discusses phase changes. The main focus is on heat capacity, its calculation, and examples illustrating its application. The lecture concludes with a summary of key points.

What is the scientific definition of a calorie?

• The energy needed to raise the temperature of one gram of water by one degree Celsius.

• The energy needed to raise the temperature of one kilogram of water by one degree Celsius.

• The energy needed to raise the temperature of one gram of water by ten degrees Celsius.

• The energy needed to raise the temperature of one kilogram of water by ten degrees Celsius.

How many scientific calories are equivalent to one nutritional Calorie?

• 10

• 10000

• 100

• 1000

Who conducted the experiment that demonstrated the conversion of potential energy to kinetic energy and then to heat?

• Albert Einstein

• Niels Bohr

• Isaac Newton

• James Prescott Joule

What is the mechanical equivalent of one kilocalorie in joules?

• 2000 joules

• 1000 joules

• 5000 joules

• 4186 joules

At what temperature does water boil and change from a liquid to a gas?

• 50 degrees Celsius

• 150 degrees Celsius

• 0 degrees Celsius

• 100 degrees Celsius

What is the specific heat of a substance?

• The amount of heat needed to raise one kilogram of the material by ten degrees Celsius.

• The amount of heat needed to raise one gram of the material by one degree Celsius.

• The amount of heat needed to raise one kilogram of the material by one degree Celsius.

• The amount of heat needed to raise one gram of the material by ten degrees Celsius.

Which of the following factors does NOT affect the heat transfer in a substance?

• Change in temperature

• Mass of the substance

• Phase of the substance

• Color of the substance

If you have twice the mass of a substance, how much more heat is needed to raise its temperature by the same amount?

• Four times the amount of heat

• Twice the amount of heat

• The same amount of heat

• Half the amount of heat

How much heat is required to raise the temperature of 0.25 liters of water from 20 degrees Celsius to 80 degrees Celsius?

• 45 kilojoules

• 89.8 kilojoules

• 62.8 kilojoules

• 27 kilojoules

What is the temperature change of brake material when a truck descends 75 meters and retains 10% of the energy?

• 11.2 degrees Celsius

• 5.2 degrees Celsius

• 7.2 degrees Celsius

• 9.2 degrees Celsius