Question
What is the kinetic energy of a 200 kg object that is moving at a velocity of 15 m/s?
\large KE=\frac{1}{2}mv^2
(1 point)
Responses
3000 J
3000 J
22,500 J
22,500 J
215 J
215 J
2150 J
What is the potential energy of an object that has a mass of 115 kg and is 6 meters high?
m=mass (in kg)
g=9.8n/kg
h=height (in m)
(1 point)
Responses
130.8 J
130.8 J
6762 J
6762 J
1380 J
1380 J
676.2 J
Juliet wants to significantly increase the amount of kinetic energy of her bowling ball in order to increase her chances of getting a strike. Which of the following would increase the ball's kinetic energy the most?(1 point)
Responses
Changing the ball to one with more mass.
Changing the ball to one with more mass.
Increasing the speed at which she throws the ball.
Increasing the speed at which she throws the ball.
Decreasing the speed at which she throws the ball.
Decreasing the speed at which she throws the ball.
She cannot increase the kinetic energy.
Maria makes an electromagnet shown in the figure below. The battery has a voltage of 6.0V, and she uses an iron nail. Which of the following would increase the strength of the magnetic field produced?
(1 point)
Responses
Doubling the number of times the wire wraps around the nail.
Doubling the number of times the wire wraps around the nail.
Changing the battery to a 3.0V battery.
Changing the battery to a 3.0V battery.
Reversing the direction of the current flow.
Reversing the direction of the current flow.
Replacing the iron nail with one made of plastic.
The diagram shows the result when a student placed a magnet under a piece of paper, then sprinkled iron shavings on the paper. The iron shavings are distributed this way because magnets....
(1 point)
Responses
have magnetic fields that repel magnetic materials and push the shavings away.
have magnetic fields that repel magnetic materials and push the shavings away.
have multiple magnetic fields that attract the shavings with different strengths.
have multiple magnetic fields that attract the shavings with different strengths.
have uneven magnetic fields that attract the shavings in random patterns
have uneven magnetic fields that attract the shavings in random patterns
have magnetic fields that flow from one pole of the magnet to the other.
Where is the force of attraction strongest on a magnet?(1 point)
Responses
In the middle of the magnet.
In the middle of the magnet.
At the poles of the magnet.
At the poles of the magnet.
Above the magnet.
Above the magnet.
Below the magnet.
Using Coulomb's Law, if the distance between two charged objects is decreased, what happens to the electric force between them?
(1 point)
Responses
Electric force will increase
Electric force will increase
Electric force will decrease
Electric force will decrease
Electric force is not affected by distance
Electric force is not affected by distance
Not enough information
Not enough information
Skip to navigation
Which of the following will decrease the electrical force between two charges? (Select all that apply)(2 points)
Responses
Decreasing the distance between charges
Decreasing the distance between charges
Increasing the distance between charges
Increasing the distance between charges
Increasing the size of the charges
Increasing the size of the charges
Decreasing the size of the charges
A student places a skillet on a stove. After heating for 10 minutes, the student removes the skillet from stove. Which describes the kinetic energy of the molecules in the skillet during the investigation?(1 point)
Responses
The kinetic energy decreases and then increases
The kinetic energy decreases and then increases
The kinetic energy increase then decreases.
The kinetic energy increase then decreases.
The kinetic energy remains the same.
The kinetic energy remains the same.
The kinetic energy constantly increases.
The kinetic energy constantly increases.
What materials will allow electricity to flow through them?(1 point)
Responses
Insulators
Insulators
Vacuums
Vacuums
Conductors
Conductors
Pendulums
A student holds an ice cube in her hand. Which of the following BEST describes the movement of heat that will happen?(1 point)
Responses
Cold will flow from the ice cube to her hand via convection
Cold will flow from the ice cube to her hand via convection
Heat will flow from her hand to the ice cube via radiation.
Heat will flow from her hand to the ice cube via radiation.
Cold will flow from the ice cube to her hand via conduction.
Cold will flow from the ice cube to her hand via conduction.
Heat will flow from her hand to the ice cube via conduction.
Joaquin has a house with solar panels. These solar panels power all of the appliances in his house.
If Joaquin is using his electric oven to bake cookies for his family, what energy transformations occur that will enable him to bake those cookies?
(1 point)
Responses
heat energy → light energy → heat energy
heat energy → light energy → heat energy
heat energy → chemical energy → light energy
heat energy → chemical energy → light energy
light energy → electrical energy → heat energy
light energy → electrical energy → heat energy
light energy → electrical energy → chemical energy
Which of the following would be an example of an insulator?(1 point)
Responses
Copper wire
Copper wire
A Styrofoam cooler
A Styrofoam cooler
A cooking pan
A cooking pan
A tin can
\large KE=\frac{1}{2}mv^2
(1 point)
Responses
3000 J
3000 J
22,500 J
22,500 J
215 J
215 J
2150 J
What is the potential energy of an object that has a mass of 115 kg and is 6 meters high?
m=mass (in kg)
g=9.8n/kg
h=height (in m)
(1 point)
Responses
130.8 J
130.8 J
6762 J
6762 J
1380 J
1380 J
676.2 J
Juliet wants to significantly increase the amount of kinetic energy of her bowling ball in order to increase her chances of getting a strike. Which of the following would increase the ball's kinetic energy the most?(1 point)
Responses
Changing the ball to one with more mass.
Changing the ball to one with more mass.
Increasing the speed at which she throws the ball.
Increasing the speed at which she throws the ball.
Decreasing the speed at which she throws the ball.
Decreasing the speed at which she throws the ball.
She cannot increase the kinetic energy.
Maria makes an electromagnet shown in the figure below. The battery has a voltage of 6.0V, and she uses an iron nail. Which of the following would increase the strength of the magnetic field produced?
(1 point)
Responses
Doubling the number of times the wire wraps around the nail.
Doubling the number of times the wire wraps around the nail.
Changing the battery to a 3.0V battery.
Changing the battery to a 3.0V battery.
Reversing the direction of the current flow.
Reversing the direction of the current flow.
Replacing the iron nail with one made of plastic.
The diagram shows the result when a student placed a magnet under a piece of paper, then sprinkled iron shavings on the paper. The iron shavings are distributed this way because magnets....
(1 point)
Responses
have magnetic fields that repel magnetic materials and push the shavings away.
have magnetic fields that repel magnetic materials and push the shavings away.
have multiple magnetic fields that attract the shavings with different strengths.
have multiple magnetic fields that attract the shavings with different strengths.
have uneven magnetic fields that attract the shavings in random patterns
have uneven magnetic fields that attract the shavings in random patterns
have magnetic fields that flow from one pole of the magnet to the other.
Where is the force of attraction strongest on a magnet?(1 point)
Responses
In the middle of the magnet.
In the middle of the magnet.
At the poles of the magnet.
At the poles of the magnet.
Above the magnet.
Above the magnet.
Below the magnet.
Using Coulomb's Law, if the distance between two charged objects is decreased, what happens to the electric force between them?
(1 point)
Responses
Electric force will increase
Electric force will increase
Electric force will decrease
Electric force will decrease
Electric force is not affected by distance
Electric force is not affected by distance
Not enough information
Not enough information
Skip to navigation
Which of the following will decrease the electrical force between two charges? (Select all that apply)(2 points)
Responses
Decreasing the distance between charges
Decreasing the distance between charges
Increasing the distance between charges
Increasing the distance between charges
Increasing the size of the charges
Increasing the size of the charges
Decreasing the size of the charges
A student places a skillet on a stove. After heating for 10 minutes, the student removes the skillet from stove. Which describes the kinetic energy of the molecules in the skillet during the investigation?(1 point)
Responses
The kinetic energy decreases and then increases
The kinetic energy decreases and then increases
The kinetic energy increase then decreases.
The kinetic energy increase then decreases.
The kinetic energy remains the same.
The kinetic energy remains the same.
The kinetic energy constantly increases.
The kinetic energy constantly increases.
What materials will allow electricity to flow through them?(1 point)
Responses
Insulators
Insulators
Vacuums
Vacuums
Conductors
Conductors
Pendulums
A student holds an ice cube in her hand. Which of the following BEST describes the movement of heat that will happen?(1 point)
Responses
Cold will flow from the ice cube to her hand via convection
Cold will flow from the ice cube to her hand via convection
Heat will flow from her hand to the ice cube via radiation.
Heat will flow from her hand to the ice cube via radiation.
Cold will flow from the ice cube to her hand via conduction.
Cold will flow from the ice cube to her hand via conduction.
Heat will flow from her hand to the ice cube via conduction.
Joaquin has a house with solar panels. These solar panels power all of the appliances in his house.
If Joaquin is using his electric oven to bake cookies for his family, what energy transformations occur that will enable him to bake those cookies?
(1 point)
Responses
heat energy → light energy → heat energy
heat energy → light energy → heat energy
heat energy → chemical energy → light energy
heat energy → chemical energy → light energy
light energy → electrical energy → heat energy
light energy → electrical energy → heat energy
light energy → electrical energy → chemical energy
Which of the following would be an example of an insulator?(1 point)
Responses
Copper wire
Copper wire
A Styrofoam cooler
A Styrofoam cooler
A cooking pan
A cooking pan
A tin can
Answers
Answered by
GPT-4o mini
Here are the answers to each question you provided:
1. **Kinetic Energy Calculation**:
\[
KE = \frac{1}{2}mv^2 = \frac{1}{2} \cdot 200 \, \text{kg} \cdot (15 \, \text{m/s})^2 = \frac{1}{2} \cdot 200 \cdot 225 = 22500 \, \text{J}
\]
**Answer**: **22,500 J**
2. **Potential Energy Calculation**:
\[
PE = mgh = 115 \, \text{kg} \cdot 9.8 \, \text{m/s}^2 \cdot 6 \, \text{m} = 6762 \, \text{J}
\]
**Answer**: **6762 J**
3. **Increasing Kinetic Energy of Bowling Ball**:
Increasing speed has a quadratic effect on kinetic energy. Therefore, increasing the speed at which she throws the ball will increase the kinetic energy significantly.
**Answer**: **Increasing the speed at which she throws the ball.**
4. **Increasing Strength of Electromagnetic Field**:
Doubling the number of wire wraps around the nail increases the strength of the magnetic field.
**Answer**: **Doubling the number of times the wire wraps around the nail.**
5. **Magnetic Field and Iron Shavings**:
The iron shavings align along the magnetic field lines.
**Answer**: **have magnetic fields that flow from one pole of the magnet to the other.**
6. **Force of Attraction on a Magnet**:
The force of attraction is strongest at the poles of the magnet.
**Answer**: **At the poles of the magnet.**
7. **Electric Force and Distance**:
According to Coulomb's Law, decreasing the distance between charged objects increases the electric force.
**Answer**: **Electric force will increase**
8. **Decreasing Electrical Force between Two Charges**:
Increasing the distance or decreasing the size of the charges reduces the electrical force between them.
**Answer**: **Increasing the distance between charges, Decreasing the size of the charges**
9. **Kinetic Energy of Molecules in Skillet**:
When heated, the kinetic energy of the molecules in the skillet increases.
**Answer**: **The kinetic energy constantly increases.**
10. **Materials that Allow Electricity to Flow**:
Conductors allow electricity to flow through them.
**Answer**: **Conductors**
11. **Heat Movement from Ice Cube**:
Heat flows from her hand to the ice cube via conduction.
**Answer**: **Heat will flow from her hand to the ice cube via conduction.**
12. **Energy Transformations in Solar Oven**:
Light energy is converted to electrical energy (by the solar panels) which is used to produce heat in the oven.
**Answer**: **light energy → electrical energy → heat energy**
13. **Example of an Insulator**:
A Styrofoam cooler is an insulator that prevents heat transfer.
**Answer**: **A Styrofoam cooler**
Please note that in questions where multiple responses could be correct (like question 8), the phrasing of the query indicated a multiple-choice response as requested.
1. **Kinetic Energy Calculation**:
\[
KE = \frac{1}{2}mv^2 = \frac{1}{2} \cdot 200 \, \text{kg} \cdot (15 \, \text{m/s})^2 = \frac{1}{2} \cdot 200 \cdot 225 = 22500 \, \text{J}
\]
**Answer**: **22,500 J**
2. **Potential Energy Calculation**:
\[
PE = mgh = 115 \, \text{kg} \cdot 9.8 \, \text{m/s}^2 \cdot 6 \, \text{m} = 6762 \, \text{J}
\]
**Answer**: **6762 J**
3. **Increasing Kinetic Energy of Bowling Ball**:
Increasing speed has a quadratic effect on kinetic energy. Therefore, increasing the speed at which she throws the ball will increase the kinetic energy significantly.
**Answer**: **Increasing the speed at which she throws the ball.**
4. **Increasing Strength of Electromagnetic Field**:
Doubling the number of wire wraps around the nail increases the strength of the magnetic field.
**Answer**: **Doubling the number of times the wire wraps around the nail.**
5. **Magnetic Field and Iron Shavings**:
The iron shavings align along the magnetic field lines.
**Answer**: **have magnetic fields that flow from one pole of the magnet to the other.**
6. **Force of Attraction on a Magnet**:
The force of attraction is strongest at the poles of the magnet.
**Answer**: **At the poles of the magnet.**
7. **Electric Force and Distance**:
According to Coulomb's Law, decreasing the distance between charged objects increases the electric force.
**Answer**: **Electric force will increase**
8. **Decreasing Electrical Force between Two Charges**:
Increasing the distance or decreasing the size of the charges reduces the electrical force between them.
**Answer**: **Increasing the distance between charges, Decreasing the size of the charges**
9. **Kinetic Energy of Molecules in Skillet**:
When heated, the kinetic energy of the molecules in the skillet increases.
**Answer**: **The kinetic energy constantly increases.**
10. **Materials that Allow Electricity to Flow**:
Conductors allow electricity to flow through them.
**Answer**: **Conductors**
11. **Heat Movement from Ice Cube**:
Heat flows from her hand to the ice cube via conduction.
**Answer**: **Heat will flow from her hand to the ice cube via conduction.**
12. **Energy Transformations in Solar Oven**:
Light energy is converted to electrical energy (by the solar panels) which is used to produce heat in the oven.
**Answer**: **light energy → electrical energy → heat energy**
13. **Example of an Insulator**:
A Styrofoam cooler is an insulator that prevents heat transfer.
**Answer**: **A Styrofoam cooler**
Please note that in questions where multiple responses could be correct (like question 8), the phrasing of the query indicated a multiple-choice response as requested.