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Question

Which student's explanation BEST describes the type of energy transformations that occur when an adult plugs in a space heater?

Question 2 options:

Student 4: Thermal energy is converted to nuclear energy and then to sound energy.

Student 2: Chemical energy is converted to electrical energy and then to thermal energy.

Student 1: Electrical energy is converted to thermal energy and then to potential energy.

Student 3: Mechanical energy is converted to kinetic energy and then to electromagnetic energy.

Question 3 (1 point)

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Use the information, picture, and table to answer the following question.

The picture shows a wind turbine being used to help provide energy to homes. Students are tasked with identifying the type of system and energy transformations that take place in the picture.

Student 1 Closed system because the electrical energy is part of a system that does not allow any other matter or energy to enter or exit the system; kinetic to electrical to sound and light.
Student 2 Closed system because the wind and electrical energy are part of a system that does not allow any other matter or energy to enter or exit the system; kinetic to electrical to mechanical to electrical to sound and light.
Student 3 Open system because the wind and electrical energy are part of a system that allows matter or energy to enter or exit the system; kinetic to mechanical to electrical to sound and light.
Student 4 Open system because the wind is part of a system that allows matter or energy to enter or exit the system; kinetic to electrical to mechanical to electrical to sound and light.
Which student explains the illustration correctly?

Question 3 options:

Student 1

Student 3

Student 4

Student 2

Question 4 (1 point)

Listen
Which jumpers will have equal amounts of kinetic and potential energy? (select 2 answers)

Question 4 options:

Jumper 3

Jumper 2

Jumper 5

Jumper 1

Jumper 4

Question 5 (1 point)

Listen
Use the information and image to answer the following question.

Students use the image to explore the law of conservation of energy. Students will write up their procedures for using the potential and kinetic energy formulas at different points on the roller coaster.

Procedure:

Step 1
Solve for mechanical energy using the potential and kinetic energies at point C.

Step 2
Use the calculated potential energy at point A as the mechanical energy for the roller coaster.

Step 3
Solve for velocity at point E using the mechanical energy at point C for kinetic energy.

Step 4
Calculate potential energy at point E, then find kinetic energy using mechanical energy at point A and the potential energy at point E.

Step 5
Solve for velocity at point E using the calculated kinetic energy.

Which of the following steps should the students use to find the velocity at Point E?

Question 5 options:

Steps 1,4,5

Steps 1,3,4

Steps 2,3,4

Steps 2,4,5

Question 6 (1 point)

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A metal spoon was left in a pot of hot soup. How does the heat move from the soup to the metal spoon?

Question 6 options:

It moves through conduction, because heat is transferred directly from the soup to the spoon.

It moves through convection, because heat is transferred directly from the soup to the spoon.

It moves through conduction, because heat is transferred through a difference in densities.

It moves through convection, because heat is transferred through a difference in densities.

Question 7 (1 point)

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A student conducts an experiment to compare the transfer of thermal energy while heating three different materials: metal, water, and air. Which of the following observations is most likely to occur during the experiment?

Question 7 options:

Thermal energy transfers fastest in water due to its high thermal conductivity.

Thermal energy transfers equally fast in all three materials.

Thermal energy transfers fastest in air due to its low density.

Thermal energy transfers fastest in metal due to its high thermal conductivity.

Question 8 (1 point)

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Use the picture to answer the following question.

Which answer choice BEST describes how the cube becomes heated when it is placed into the boiling water?

Question 8 options:

The cube is heated as particles bump into each other causing thermal energy to be transferred between particles through convection.

The cube is heated as particles bump into each other causing thermal energy to be transferred between particles through conduction.

The cube is heated as heated particles within the cube rise and the cooler particles sink so that the heat is transferred through convection.

The cube is heated as heated particles within the cube rise and the cooler particles sink so that the heat is transferred through conduction.

Answer 1

Here are the best answers for each question based on the information provided:

Question 2: The student whose explanation BEST describes the type of energy transformations that occur when an adult plugs in a space heater is:

• Student 1: Electrical energy is converted to thermal energy and then to potential energy.

Question 3: The student who explains the illustration correctly regarding the energy transformations in the wind turbine is:

• Student 3: Open system because the wind and electrical energy are part of a system that allows matter or energy to enter or exit the system; kinetic to mechanical to electrical to sound and light.

Question 4: To determine which jumpers will have equal amounts of kinetic and potential energy, the best options are:

• Jumper 3
• Jumper 5

(Note: However, without context or heights provided for each jumper, it's challenging to confirm the correct jumpers.)

Question 5: To find the velocity at Point E, the students should use:

• Steps 2, 4, 5

Question 6: The heat moves from the soup to the metal spoon:

• It moves through conduction, because heat is transferred directly from the soup to the spoon.

Question 7: The most likely observation during the experiment is:

• Thermal energy transfers fastest in metal due to its high thermal conductivity.

Question 8: The BEST description of how the cube becomes heated when it is placed into the boiling water is:

• The cube is heated as particles bump into each other causing thermal energy to be transferred between particles through conduction.

If you have any further questions or need clarifications, feel free to ask!