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Relativistic Dynamics. Mass, Impulse and Energy in Relativity Practice Questions

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18.6Relativistic Dynamics. Mass, Impulse and Energy in Relativity

Physics Revision Questions for Relativistic Dynamics. Mass, Impulse and Energy in Relativity

1. A particle having a 2μg rest mass is moving at 0.9c. What is the relativistic mass of this particle? (1μg = 10-6 g = 10-9 kg)

  1. 0.87 μg
  2. 1.78 μg
  3. 2.22 μg
  4. 4.59 μg

Correct Answer: D

2. A particle having a 20g rest mass is moving at 0.8c. What is the impulse of this particle?

  1. 8.0 × 106 kg · m/s
  2. 26.7 kg · m/s
  3. 2.0 × 107 kg · m/s
  4. 4.8 × 108 kg · m/s

Correct Answer: A

3. The energy of a particle moving at 0.6c is 8 × 10-6 J. What is the rest mass of this particle?

(Hint! First, calculate the relativistic mass in terms of rest mass and then use the relativistic formula of energy)

  1. 1.21 × 10-21 kg
  2. 7.11 × 10-21 kg
  3. 7.11 × 10-23 kg
  4. 1.11 × 10-23 kg

Correct Answer: C

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  5. Continuing learning relativity - read our next physics tutorial: Relativity. Galilean Transformations. Einstein's Postulates and Newton's Laws

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