Question

Particulate Motion Unit Test

1. There are two pieces of copper. Piece A is at 70 degrees, while piece B is at 150 degrees. Which piece has more thermal energy? (1 point)

Piece A, because its particles move slower

Piece B, because its particles move faster

Piece A, because its particles move faster

Piece B, because its particles move slower

2. The electrons in the copper atoms in a wire start to move when an electric potential difference is introduced. Which statement about this situation is true?(1 point)

The macroscopic movement of the electrons creates a microscopic flow of electricity.

The macroscopic movement of the electrons creates a macroscopic flow of electricity.

The microscopic movement of the electrons creates a macroscopic flow of electricity.

The microscopic movement of the electrons creates a microscopic flow of electricity.

3. Which statement describes the gravitational energy and energy stored in a magnetic field when objects are drawn close to each other?(1 point)

Both gravitational energy and energy stored in a magnetic field attract.

Both gravitational energy and energy stored in a magnetic field repel.

Gravitational energy attracts; energy stored in a magnetic field attracts or repels.

Gravitational energy attracts; energy stored in a magnetic field repels.

4. A scientist is heating a piece of metal and measuring its temperature. She observes that the temperature of the metal is rapidly increasing. Which statement is correct about the thermal energy of the metal? (1 point)

Thermal energy will increase for as long as temperature is increasing.

Thermal energy will increase for as long as the metal is in solid state.

Thermal energy will increase for as long as the metal is absorbing heat energy.

Thermal energy will increase for as long as the potential energy is zero.

5. A student places a piece of ice inside a glass beaker at room temperature and heats them until they both come to 70°C. Which statement is correct about the energies of the ice and beaker? (1 point)

The thermal energy of the beaker has increased more than the thermal energy of the ice.

The thermal energy of the ice has increased more than the thermal energy of the beaker.

The potential energy of both the ice and beaker have increased the same amount.

The kinetic energy of both the ice and beaker have increased the same amount.

6. Which energy types are both examples of energy on a macroscopic scale?(1 point)

chemical energy and gravitational potential energy

thermal energy and spring potential energy

gravitational potential energy and kinetic energy

kinetic energy and thermal energy

7. A high diver steps off the diving platform and begins falling toward the pool of water below. Which statement about this situation is correct?(1 point)

The amount of energy that is transferred to thermal energy due to friction will be greater at the the top of the fall than at the bottom of the fall.

The gravitational potential energy of the diver decreases as it changes to kinetic energy.

The kinetic energy of the diver decreases as the diver approaches the water.

The gravitational potential energy of the diver increases because of the change in thermal energy due to friction.

8. For a system that contains a rock falling through the air, which situation is always true?(1 point)

The total potential energy of the system is conserved.

The total kinetic energy of the system is conserved.

The total mechanical energy of the system is conserved.

The total energy of the system is conserved.

Answer 1

Answer:

1. piece b because it’s particles move faster.

2. the microscopic movement of the electrons creates a macroscopic flow of electricity.

3. gravitational energy attracts; energy stored in a magnetic field attracts or repels.

4. thermal energy will increase for as long as the metal is absorbing heat energy.

5. the thermal energy of the ice has increased more than the thermal energy of the beaker.

6. gravitational potential energy and kinetic energy

7. the gravitational potential energy of the river decreases as it changes to kinetic energy

8. the total energy of the system is conserved.

Explanation:

just took the test; these are all correct!

Answer 2

For a system that contains a rock falling through the air, the total mechanical energy of the system is conserved.

• The piece that has a greater thermal energy is the piece that is at higher temperature because Piece B has particles that  move faster. The statement that is true regarding electron movement in a copper wire is that; "the microscopic movement of the electrons creates a macroscopic flow of electricity."

• The energy stored in a magnetic field is related to the gravitational energy by the statement; "gravitational energy attracts; energy stored in a magnetic field attracts or repels."

• The statement that is correct about the metal whose temperature is increasing rapidly is; "thermal energy will increase for as long as temperature is increasing."

• The statement that is true about the  ice inside a glass beaker is that; "the kinetic energy of both the ice and beaker have increased the same amount."

• The energy types that are both examples of energy on a macroscopic scale are chemical energy and gravitational potential energy.

• As the diver steps off the diving platform and begins falling toward the pool of water below, the gravitational potential energy of the diver decreases as it changes to kinetic energy.

• For a system that contains a rock falling through the air, the total mechanical energy of the system is conserved.

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