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Which formula can be used to express the law of conservation of momentum, where p = momentum?

A
pi = pf
B
pi > pf
C
pi < pf
D
pi ≠ pf
2
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The diagram shows two balls before they collide.

Question illustration
A
0.0 kg • m/s
B
0.2 kg • m/s
C
0.3 kg • m/s
D
0.4 kg • m/s
3

A NASA explorer spacecraft with a mass of 1,000 kg takes off in a positive direction from a stationary asteroid.If the velocity of the spacecraft is 250 m/s and the asteroid is pushed back –25 m/s, what is the mass of the asteroid? Assume there is no net force on the system.

A
100 kg
B
6,250 kg
C
10,000 kg
D
6,250,000 kg
4

The law of conservation of momentum states that, if left alone, what happens to the total momentum of two interacting objects that make up a system?

A
it increases over time
B
it remains the same
C
it eventually becomes zero
D
changes based on how they collide
5

The chart shows masses and velocities of four objects.

Question illustration
A
W, X, Y, Z
B
Z, Y, X, W
C
Z, X, W, Y
D
Y, W, X, Z
6

When someone throws a ball, the action force is the person pushing on the ball. What is the reaction force?

A
the ball pushing on the person
B
the ball pushing against air
C
the ball being pulled toward the ground
D
the ball being pulled away from the person
7

The chart show the masses and velocities of two colliding objects that stick together after a collision.

Question illustration
A
4,500 g · m/s
B
1,750 g · m/s
C
1,500 kg · m/s
D
3,000 kg · m/s
8

According to Newton’s third law of motion, which are equal?

A
momentum and velocity
B
collision time and stop time
C
mass and momentum
D
action force and reaction force
9

A 50 kg pitcher throws a baseball with a mass of 0.15 kg. If the ball is thrown with a positive velocity of 35 m/s and there is no net force on the system, what is the velocity of the pitcher?

A
−0.1 m/s
B
−0.2 m/s
C
−0.7 m/s
D
−1.4 m/s
10

A car has a momentum of 20,000 kg • m/s. What would the car’s momentum be if its velocity doubles?

A
10,000 kg • m/s
B
20,000 kg • m/s
C
40,000 kg • m/s
D
80,000 kg • m/s

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