1) A proton, which has a mass of 1.67 × 10 -27, is moving at 0.80 c relative to

Question

1) A proton, which has a mass of 1.67 × 10-27, is moving at 0.80c relative to the laboratory. What does a physicist in that lab measure for its momentum? (c = 3.0 × 108 m/s)

5.8 × 10-19 kg m/s

6.7 × 10-19 kg m/s

4.4 × 10-19 kg m/s

5.0 × 10-19 kg m/s

4.0 × 10-19 kg m/s

2)

An object with a rest mass of 0.456-kg is moving at 1.20 × 108 m/s. What is the magnitude of its momentum? (c = 3.00 × 108 m/s)

5.67 × 107 kg m/s

5.87 × 107 kg m/s

5.57 × 107 kg m/s

5.47 × 107 kg m/s

5.97 × 107 kg m/s

5.8 × 10-19 kg m/s

6.7 × 10-19 kg m/s

4.4 × 10-19 kg m/s

5.0 × 10-19 kg m/s

4.0 × 10-19 kg m/s

Explanation / Answer

the formula for reletivistic momentum is

p = mu/ root 1- (u/c)^2 = 1.67 * 10 ^-27 ( 0.80 c/ root 1- ( 0.80c/c)^2 = 6.7 * 10 ^-19 kg m/s

As per guide lines I did first probelm please post second question next time

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