14 Questions
| Attempts: 1343

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Questions and Answers

- 1.Two objects stick together and move with a common velocity after colliding. Identify the type of collision.
- A.
Elastic

- B.
Inelastic

- C.
Perfectly elastic

- D.
Perfectly Inelastic

- 2.Two billiard balls collide. Identify the type of collision.
- A.
Elastic

- B.
Inelastic

- C.
Perfectly elastic

- D.
Perfectly inelastic

- 3.Two balls of dough collide and stick together. Identify the type of collision.
- A.
Elastic

- B.
Inelastic

- C.
Perfectly elastic

- D.
Perfectly inelastic

- 4.Two cars collide, lock bumpers, and move together after the collision.
- A.
Elastic

- B.
Inelastic

- C.
Perfectly elastic

- D.
Perfectly inelastic

- 5.A tennis ball is dropped from 1.0 m, bounces off the ground, and rises to 0.85 m. What kind of collision occurred between the ball and the ground?
- A.
Elastic

- B.
Inelastic

- C.
Perfectly elastic

- D.
Perfectly inelastic

- 6.In what kind of collision is kinetic energy always conserved?
- A.
Elastic

- B.
Inelastic

- C.
Perfectly elastic

- D.
Perfectly inelastic

- 7.A helium atom collides with another helium atom in an elastic collision. Which of the following is true?
- A.
Both momentum and kinetic energy are conserved.

- B.
Momentum is conserved but kinetic energy is not conserved.

- C.
Kinetic energy is conserved but momentum is not conserved.

- D.
Neither momentum nor kinetic energy is conserved.

- 8.Two playground balls collide in an inelastic collision. Which of the following is true?
- A.
Both momentum and kinetic energy are conserved.

- B.
Momentum is conserved, but kinetic energy is not conserved.

- C.
Kinetic energy is conserved, but momentum is not conserved.

- D.
Neither momentum nor kinetic energy is conserved.

- 9.In an inelastic collision between two objects with unequal masses,
- A.
The total momentum of the system will increase.

- B.
The total momentum of the system will decrease.

- C.
The kinetic energy of one object will increase by the amount that the kinetic energy of the other object decreases.

- D.
The momentum of one object will increase by the amount that the momentum of the other object decreases.

- 10.A billiard ball collides with a stationary identical billiard ball in an elastic head-on collision. After the collision, which of the following is true of the first ball?
- A.
It maintains its initial velocity.

- B.
It has one-half its initial velocity.

- C.
It comes to rest.

- D.
It moves in the opposite direction.

- 11.A ship with a mass of 4.50 x 10
^{7}kg and a velocity of 2.30 m/s to the north collides with another ship whose mass is 2.30 x 10^{7}kg. If the speed of the second ship is 3.40 m/s to the south, what is the change in the kinetic energy after the two ships undergo a perfectly inelastic collision?- A.
0.38 m/s

- B.
4.91 x 10^6 J

- C.
-2.47 x 10^8 J

- D.
2.52 x 10^8 J

- 12.A ball of clay with a mass of 55 g and a speed of 1.5 m/s collides with a 55 g ball of clay that is at rest. What is the kinetic energy after the inelastic collision?
- A.
0.03 J

- B.
-0.03 J

- C.
0.06 J

- D.
0.75 m/s

- 13.The hog-nosed bat is the smallest mammal on Earth: it is about the same size as a bumblebee and has an average mass of 2.0 g. Suppose a hog-nosed bat with this mass flies at 2.0 m/s when it detects a bug with a mass of 0.20 g flying directly toward it at 8.0 m/s. What is the velocity of the bug and the bat after the collision?
- A.
.004 m/s

- B.
0.0024 m/s

- C.
2.55 m/s

- D.
1.09 m/s

- 14.The cheapest car ever commercially produced was the , which sold in 1922 in the United States for about $250. The car’s mass was only 111 kg. Suppose two of these cars are used in a stunt crash for an action film. If one car’s initial velocity is 9.00 m/s to the right and the other car’s velocity is 5.00 m/s to the left, what is the velocity of the cars after the collision?
- A.
7 m/s

- B.
4 m/s

- C.
2 m/s

- D.
14 m/s

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