Question
What does an object’s kinetic energy depend on?(1 point)
Responses
its weight and speed
its weight and speed
its potential energy
its potential energy
its mass and speed
its mass and speed
its speed and trajectory
Two city buses are traveling at 24 miles per hour. The buses are the same model and year. One bus has 30 passengers. The other bus has 12 passengers. Which is the best prediction?(1 point)
Responses
The bus with 12 passengers will have less kinetic energy.
The bus with 12 passengers will have less kinetic energy.
The bus with 30 passengers will have less kinetic energy.
The bus with 30 passengers will have less kinetic energy.
The buses will have the same amount of kinetic energy.
The buses will have the same amount of kinetic energy.
The buses’ kinetic energies will depend on their routes.
A softball player hits a ball at 78 miles per hour. Then she hits a ball at 80 miles per hour. Which is the best prediction?(1 point)
Responses
The balls’ kinetic energies will depend on the distances they travel.
The balls’ kinetic energies will depend on the distances they travel.
The balls will have the same amount of kinetic energy.
The balls will have the same amount of kinetic energy.
The ball hit at 80 miles per hour will have more kinetic energy.
The ball hit at 80 miles per hour will have more kinetic energy.
The ball hit at 78 miles per hour will have more kinetic energy.
Question
A hawk is chasing a sparrow. At the beginning of the chase, the hawk’s kinetic energy is 5.1 Joules. At the end of the chase, the hawk doubles its speed. What is the best prediction for its kinetic energy at the end of the chase?(1 point)
Responses
20.4 J
20.4 J
5.1 J
5.1 J
10.2 J
10.2 J
2.55 J
2.55 J
Question
A student rolls two marbles down an inclined plane. One marble has a mass of 4.8 grams. The student calculates its kinetic energy to be 0.0035 Joules when it reaches the end of the plane. The second marble has a mass of 2.4 grams. What is the best prediction for its kinetic energy at the end of the plane?(1 point)
Responses
0.00175 J
0.00175 J
0.0035 J
0.0035 J
0.007 J
0.007 J
0.014 J
Responses
its weight and speed
its weight and speed
its potential energy
its potential energy
its mass and speed
its mass and speed
its speed and trajectory
Two city buses are traveling at 24 miles per hour. The buses are the same model and year. One bus has 30 passengers. The other bus has 12 passengers. Which is the best prediction?(1 point)
Responses
The bus with 12 passengers will have less kinetic energy.
The bus with 12 passengers will have less kinetic energy.
The bus with 30 passengers will have less kinetic energy.
The bus with 30 passengers will have less kinetic energy.
The buses will have the same amount of kinetic energy.
The buses will have the same amount of kinetic energy.
The buses’ kinetic energies will depend on their routes.
A softball player hits a ball at 78 miles per hour. Then she hits a ball at 80 miles per hour. Which is the best prediction?(1 point)
Responses
The balls’ kinetic energies will depend on the distances they travel.
The balls’ kinetic energies will depend on the distances they travel.
The balls will have the same amount of kinetic energy.
The balls will have the same amount of kinetic energy.
The ball hit at 80 miles per hour will have more kinetic energy.
The ball hit at 80 miles per hour will have more kinetic energy.
The ball hit at 78 miles per hour will have more kinetic energy.
Question
A hawk is chasing a sparrow. At the beginning of the chase, the hawk’s kinetic energy is 5.1 Joules. At the end of the chase, the hawk doubles its speed. What is the best prediction for its kinetic energy at the end of the chase?(1 point)
Responses
20.4 J
20.4 J
5.1 J
5.1 J
10.2 J
10.2 J
2.55 J
2.55 J
Question
A student rolls two marbles down an inclined plane. One marble has a mass of 4.8 grams. The student calculates its kinetic energy to be 0.0035 Joules when it reaches the end of the plane. The second marble has a mass of 2.4 grams. What is the best prediction for its kinetic energy at the end of the plane?(1 point)
Responses
0.00175 J
0.00175 J
0.0035 J
0.0035 J
0.007 J
0.007 J
0.014 J
Answers
GPT-4o mini
Let's go through each question one by one:
1. **What does an object’s kinetic energy depend on?**
- **Correct Response:** its mass and speed
2. **Two city buses are traveling at 24 miles per hour. The buses are the same model and year. One bus has 30 passengers. The other bus has 12 passengers. Which is the best prediction?**
- **Correct Response:** The bus with 30 passengers will have less kinetic energy.
- **Explanation:** Kinetic energy is dependent on mass. The bus with 30 passengers is heavier than the bus with 12 passengers, given that both buses are the same model.
3. **A softball player hits a ball at 78 miles per hour. Then she hits a ball at 80 miles per hour. Which is the best prediction?**
- **Correct Response:** The ball hit at 80 miles per hour will have more kinetic energy.
- **Explanation:** Kinetic energy is proportional to the square of the speed, so a small increase in speed results in a greater increase in kinetic energy.
4. **A hawk is chasing a sparrow. At the beginning of the chase, the hawk’s kinetic energy is 5.1 Joules. At the end of the chase, the hawk doubles its speed. What is the best prediction for its kinetic energy at the end of the chase?**
- **Correct Response:** 20.4 J
- **Explanation:** Kinetic energy is given by the formula KE = 1/2 mv². If the speed doubles, KE increases by a factor of 4 (since (2v)² = 4v²), so 5.1 J * 4 = 20.4 J.
5. **A student rolls two marbles down an inclined plane. One marble has a mass of 4.8 grams. The student calculates its kinetic energy to be 0.0035 Joules when it reaches the end of the plane. The second marble has a mass of 2.4 grams. What is the best prediction for its kinetic energy at the end of the plane?**
- **Correct Response:** 0.00175 J
- **Explanation:** Since the second marble has half the mass of the first, its kinetic energy will also be half, assuming they reach the same speed.
These responses are based on the principles of kinetic energy and the relationships between mass, speed, and kinetic energy.
1. **What does an object’s kinetic energy depend on?**
- **Correct Response:** its mass and speed
2. **Two city buses are traveling at 24 miles per hour. The buses are the same model and year. One bus has 30 passengers. The other bus has 12 passengers. Which is the best prediction?**
- **Correct Response:** The bus with 30 passengers will have less kinetic energy.
- **Explanation:** Kinetic energy is dependent on mass. The bus with 30 passengers is heavier than the bus with 12 passengers, given that both buses are the same model.
3. **A softball player hits a ball at 78 miles per hour. Then she hits a ball at 80 miles per hour. Which is the best prediction?**
- **Correct Response:** The ball hit at 80 miles per hour will have more kinetic energy.
- **Explanation:** Kinetic energy is proportional to the square of the speed, so a small increase in speed results in a greater increase in kinetic energy.
4. **A hawk is chasing a sparrow. At the beginning of the chase, the hawk’s kinetic energy is 5.1 Joules. At the end of the chase, the hawk doubles its speed. What is the best prediction for its kinetic energy at the end of the chase?**
- **Correct Response:** 20.4 J
- **Explanation:** Kinetic energy is given by the formula KE = 1/2 mv². If the speed doubles, KE increases by a factor of 4 (since (2v)² = 4v²), so 5.1 J * 4 = 20.4 J.
5. **A student rolls two marbles down an inclined plane. One marble has a mass of 4.8 grams. The student calculates its kinetic energy to be 0.0035 Joules when it reaches the end of the plane. The second marble has a mass of 2.4 grams. What is the best prediction for its kinetic energy at the end of the plane?**
- **Correct Response:** 0.00175 J
- **Explanation:** Since the second marble has half the mass of the first, its kinetic energy will also be half, assuming they reach the same speed.
These responses are based on the principles of kinetic energy and the relationships between mass, speed, and kinetic energy.