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**Impulse and Momentum Quiz**

Linear Impulse and Momentum Angular Impulse and Momentum Conservation of Momentum

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**1. What are the correct SI units for an angular impulse?**

a) N.s b) kg.m/s c) N.m.s d) kg.m/s2

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**a) 4.36 m/s b) 53.5 m/s c) 30.6 m/s d) 5.45 m/s**

2. If a 55.0 kg swimmer applies a horizontal impulse of 300 N.s to starting blocks, what is her starting velocity? a) 4.36 m/s b) 53.5 m/s c) 30.6 m/s d) 5.45 m/s

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3. If a person is motionless and stops a positively spinning flywheel that has a vertical axle, the person will _______. a) stay motionless b) spin positively c) spin negatively d) become confused

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**a) 4000 kg.m/s b) 3920 kg.m/s c) 500 kg.m/s d) 408 kg.m/s**

4. What is the linear momentum of a runner who weighs 500 newtons and has a horizontal velocity of 8.00 m/s? a) 4000 kg.m/s b) 3920 kg.m/s c) 500 kg.m/s d) 408 kg.m/s

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**a) 9.38 rad/s b) 24.0 rad/s c) 5.00 rad/s d) 1.600 rad/s**

5. If a figure skater takes off with an angular velocity of 5.0 rad/s and I=15 kg.m2 and then reduces her I to 8 kg.m2 what’s her final velocity? a) 9.38 rad/s b) 24.0 rad/s c) 5.00 rad/s d) rad/s

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**a) 125.0 m/s b) 100.0 m/s c) 126.3 m/s d) 115.0 m/s**

6. A 100 gram arrow penetrates a 10-kg target and gives it a velocity of 1.25 m/s. How fast was the arrow before the impact? a) m/s b) m/s c) m/s d) m/s

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**Correct answers c (N.m.s or kg.m2/s) d (=300/55) b (spin positively)**

d (=[500/9.81] x 8.0) a (=[15 x 5] / 8) c (= [1.25 x 10.1] / 0.1)

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Chapter 7: Linear Momentum CQ: 2 Problems: 1, 7, 22, 41, 45, 47. Momentum & Impulse Conservation of Momentum Types of Collisions 1.

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