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Physics Tutorial 6.8 - Momentum and Impulse in Two Dimensions. Explosions. Revision Questions
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| Tutorial ID | Title | Tutorial | Video Tutorial | Revision Notes | Revision Questions | |
|---|---|---|---|---|---|---|
| 6.8 | Momentum and Impulse in Two Dimensions. Explosions. |
Momentum and Impulse in Two Dimensions. Explosions. Revision Questions
1) A ball moving at 6 m/s collides with an identical ball at rest. As a result, the first ball moves at 4 m/s at 530 to the original direction as shown in the figure.
What is the magnitude of velocity v of the second object after the collision?
- 3.6 m/s
- 3.2 m/s
- 4.8 m/s
- 6.0 m/s
Correct Answer: C
2) A 50 g bullet hits a 20 kg metal plate at 300 to its surface as shown in the figure. The initial velocity of the bullet is 400 m/s. As a result, the metal plate moves back at 20 cm/s. If the collision lasts for 0.01 s, what is the magnitude of force exerted by thje bullet on the metal plate? Take cos 300 = 0.86, sin 300 = 0.5.
- 800 N
- 344 N
- 464 N
- 400 N
Correct Answer: A
3) A 10 kg moving at 2 m/s explodes in two pieces: 8 kg and 2 kg. The 8 kg piece turns back at 3 m/s. What is the velocity of the 2 kg piece after explosion?
- 44 m/s in the original direction
- 22 m/s in the original direction
- 22 m/s in the opposite direction
- 2 m/s in the original direction
Correct Answer: B
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