8. Use the graph to answer the question.
. A velocity versus time line graph shows three lines. The vertical axis is labeled, velocity, and the horizontal axis is labeled, time. Line A moves to the right from a point on the vertical axis above the origin parallel to the horizontal axis. Line B slopes upward from the origin to the upper right corner. Line C moves to the right from a point on the vertical axis below the origin parallel to the horizontal axis.
Which quantity or quantities is/are increasing for the object represented by Line B?
(1 point)
Responses
Velocity, position, and acceleration
Velocity, position, and acceleration
Velocity only
Velocity only
Velocity and position
Velocity and position
Velocity and acceleration
Velocity and acceleration
Velocity and acceleration.
9. The same type of engine is placed in two different airplanes. The first airplane is twice as heavy as the second airplane. Which statement is correct about the mass of the airplane and its acceleration, assuming a constant net force?(1 point)
Responses
Decreasing the mass of the airplane will result in the airplane accelerating less.
Decreasing the mass of the airplane will result in the airplane accelerating less.
Decreasing the mass of the airplane will result in the airplane accelerating more.
Decreasing the mass of the airplane will result in the airplane accelerating more.
Increasing the acceleration of the airplane causes the engine to provide more force.
Increasing the acceleration of the airplane causes the engine to provide more force.
Increasing the acceleration of the airplane causes the engine to provide less force.
Decreasing the mass of the airplane will result in the airplane accelerating more.
10. The harder a gas pedal in a car is pressed, the faster the car’s velocity increases. Which phrase best describes the relationship between how hard the gas pedal is pressed and the acceleration of the car?(1 point)
Responses
There is a negative correlation but no causation.
There is a negative correlation but no causation.
There is a positive correlation but no causation.
There is a positive correlation but no causation.
There is both a positive correlation and causation.
There is both a positive correlation and causation.
There is both a negative correlation and causation.
There is both a positive correlation and causation.
11. A helicopter is accelerating up into the air while it is also accelerating due north. Which statement about the forces acting on the helicopter is true?(1 point)
Responses
The drag on the helicopter is directed upward and to the south.
The drag on the helicopter is directed upward and to the south.
The drag on the helicopter is directed upward and to the north.
The drag on the helicopter is directed upward and to the north.
The drag on the helicopter is directed downward and to the north.
The drag on the helicopter is directed downward and to the north.
The drag on the helicopter is directed downward and to the south.
The drag on the helicopter is directed upward and to the south.
12. Which state of equilibrium is a person in while running on a treadmill?(1 point)
Responses
stable equilibrium
stable equilibrium
static equilibrium
static equilibrium
neutral equilibrium
neutral equilibrium
dynamic equilibrium
dynamic equilibrium
13. Two galaxies on opposite ends of the universe are moving away from the Earth. Each has a velocity of 200,000 km/s relative to the Earth. How fast would an observer in one of those galaxies see the other galaxy moving away?(1 point)
Responses
200,000 km/s
200,000 km/s
400,000 km/s
400,000 km/s
between 200,000 and 300,000 km/s
between 200,000 and 300,000 km/s
between 300,000 and 400,000 km/s