Question
What happens when a falling object reaches terminal velocity?(1 point)
Responses
It slows down.
It hits the ground and stops.
It stops accelerating.
It speeds up.
How does a falling object’s surface area affect calculations of terminal velocity?(1 point)
Responses
The greater the object’s surface area, the greater the air density.
The greater the object’s surface area, the more air resistance it encounters.
The greater the object’s surface area, the greater its terminal velocity.
Surface area does not affect an object’s terminal velocity.
Which is the equation for terminal velocity?(1 point)
A ball falls from a tall bridge. The ball has a mass of 0.15 kg. The air density is 1.225 kg/m^3
. The ball’s surface area is 0.0026 m^2
. The ball’s coefficient of drag is 0.007. What is the ball’s terminal velocity?(1 point)
Responses
363 m/s
402 m/s
164 m/s
30.4 m/s
Hanna wants to calculate the terminal velocity of a typical meteorite just before it hits Earth. She researches meteorites at the library and on the internet. What information does she need to find?(1 point)
Responses
a typical meteorite’s mass and average velocity
a typical meteorite’s weight, surface area, and coefficient of drag; air density close to Earth
a typical meteorite’s surface area and coefficient of drag; air density close to Earth
a typical meteorite’s weight, surface area, and coefficient of drag
Responses
It slows down.
It hits the ground and stops.
It stops accelerating.
It speeds up.
How does a falling object’s surface area affect calculations of terminal velocity?(1 point)
Responses
The greater the object’s surface area, the greater the air density.
The greater the object’s surface area, the more air resistance it encounters.
The greater the object’s surface area, the greater its terminal velocity.
Surface area does not affect an object’s terminal velocity.
Which is the equation for terminal velocity?(1 point)
A ball falls from a tall bridge. The ball has a mass of 0.15 kg. The air density is 1.225 kg/m^3
. The ball’s surface area is 0.0026 m^2
. The ball’s coefficient of drag is 0.007. What is the ball’s terminal velocity?(1 point)
Responses
363 m/s
402 m/s
164 m/s
30.4 m/s
Hanna wants to calculate the terminal velocity of a typical meteorite just before it hits Earth. She researches meteorites at the library and on the internet. What information does she need to find?(1 point)
Responses
a typical meteorite’s mass and average velocity
a typical meteorite’s weight, surface area, and coefficient of drag; air density close to Earth
a typical meteorite’s surface area and coefficient of drag; air density close to Earth
a typical meteorite’s weight, surface area, and coefficient of drag
Answers
Answered by
GPT-4o mini
1. What happens when a falling object reaches terminal velocity?
- **Response:** It stops accelerating.
2. How does a falling object’s surface area affect calculations of terminal velocity?
- **Response:** The greater the object’s surface area, the more air resistance it encounters.
3. Which is the equation for terminal velocity?
- This question seems to be missing response options, but the general equation used to calculate terminal velocity (Vt) is given by:
\[
V_t = \sqrt{\frac{2mg}{\rho C_d A}}
\]
4. A ball falls from a tall bridge. The ball has a mass of 0.15 kg. The air density is 1.225 kg/m³. The ball’s surface area is 0.0026 m². The ball’s coefficient of drag is 0.007. What is the ball’s terminal velocity?
- **Response:** To find terminal velocity (Vt), we use the formula:
\[
V_t = \sqrt{\frac{2mg}{\rho C_d A}}
\]
Plugging in the values:
- m = 0.15 kg
- g = 9.81 m/s² (acceleration due to gravity)
- ρ = 1.225 kg/m³
- C_d = 0.007
- A = 0.0026 m²
\[
V_t = \sqrt{\frac{2 \times 0.15 \times 9.81}{1.225 \times 0.007 \times 0.0026}}
\]
After performing the calculations, you would choose the correct answer from the options provided.
5. Hanna wants to calculate the terminal velocity of a typical meteorite just before it hits Earth. She researches meteorites at the library and on the internet. What information does she need to find?
- **Response:** a typical meteorite’s weight, surface area, and coefficient of drag; air density close to Earth.
- **Response:** It stops accelerating.
2. How does a falling object’s surface area affect calculations of terminal velocity?
- **Response:** The greater the object’s surface area, the more air resistance it encounters.
3. Which is the equation for terminal velocity?
- This question seems to be missing response options, but the general equation used to calculate terminal velocity (Vt) is given by:
\[
V_t = \sqrt{\frac{2mg}{\rho C_d A}}
\]
4. A ball falls from a tall bridge. The ball has a mass of 0.15 kg. The air density is 1.225 kg/m³. The ball’s surface area is 0.0026 m². The ball’s coefficient of drag is 0.007. What is the ball’s terminal velocity?
- **Response:** To find terminal velocity (Vt), we use the formula:
\[
V_t = \sqrt{\frac{2mg}{\rho C_d A}}
\]
Plugging in the values:
- m = 0.15 kg
- g = 9.81 m/s² (acceleration due to gravity)
- ρ = 1.225 kg/m³
- C_d = 0.007
- A = 0.0026 m²
\[
V_t = \sqrt{\frac{2 \times 0.15 \times 9.81}{1.225 \times 0.007 \times 0.0026}}
\]
After performing the calculations, you would choose the correct answer from the options provided.
5. Hanna wants to calculate the terminal velocity of a typical meteorite just before it hits Earth. She researches meteorites at the library and on the internet. What information does she need to find?
- **Response:** a typical meteorite’s weight, surface area, and coefficient of drag; air density close to Earth.
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