All About Energy

How does thermal energy flow?

• a. Thermal energy only flows between objects that are the same temperature

• b. Thermal energy does not flow between substances

• c. Thermal energy flows from an object with more thermal energy to an object with less thermal energy

• d. Thermal energy flows from an object with less thermal energy to an object with more thermal energy

Heat moves between two substances until they both reach the same temperature. What is this process called?

• Conduction

• Convection

• Radiation

• Thermal Equilibrium

What happened to the temperatures of the hot water and cold water from 0 hours to 4 hours?

• a. The thermal energy of the hot water decreased and the thermal energy of the cold water increased

• b. The thermal energy of the hot water increased and the thermal energy of the cold water decreased

• c. The thermal energy of the hot and cold water increased

• d. The thermal energy of the hot and cold water remained the same

What was the approximate temperature of the hot water after 30 minutes?

• a. 135° F

• b. 125° F

• c. 95° F

• d. 85° F

The graph below shows the temperatures, taken at one-minute intervals, once a newly made 400˚C metal horseshoe was dropped into a pail of water. The water had an initial temperature of 20oC. Use the graph to answer any questions that follow.

If no outside sources, such as the temperature of the air or pail, affect the energy transferred between the horseshoe and water, then, based on the graph, the –

• A. temperature of the water and horseshoe stop changing at approximately 29°C.

• B. final temperature of the horseshoe will be 400˚C.

• C. temperature of the water and horseshoe stop changing at approximately 20°C.

• D. final temperature of the horseshoe will be 20°C

The graph below shows the temperatures, taken at one-minute intervals, once a newly made 400˚C metal horseshoe was dropped into a pail of water. The water had an initial temperature of 20oC. Use the graph to answer any questions that follow.

Assuming the surrounding environment had no effect on the transfer of thermal energy, when the horseshoe was put into the water, thermal energy moved from the -

• horseshoe to the water, until the horseshoe reached the starting temperature of the water.

• water to the horseshoe, until they both reached the same temperature

• horseshoe to the water, until they both reached the same temperature.

• water to the horseshoe, until the water reached the starting temperature of the horseshoe

What is an energy resource?

• a. An object that is used to destroy energy

• b. Substances that are used to locate fossil fuels

• c. Objects that require energy

• d. Substances that can be used as sources of energy

The pie chart below shows all of the renewable energy used to generate electricity for the United States in 2012. Use the pie chart to answer any questions that follow

Wind energy forms 27.0% of the United States’ renewable energy and has many advantages and disadvantages. Which of the following is NOT a disadvantage of wind energy?

• It requires coal to be burned in order to make the wind turbines spin

• It produces large amounts of sound pollution when the wind turbines spin.

• It only produces energy when the wind is blowing.

• It requires many large turbines to produce enough energy.

Which type of thermal energy transfer exists when your doctor takes an x-ray of your body?

• Conduction

• Convection

• Radiation

• none of the above

The provided table shows the properties of four different sample materials. A student has a substance with a density of 1.28 g/cm3. Which sample does the student have?

• Sample 1

• Sample 2

• Sample 3

• Sample 4