Which of the following statements are IMPOSSIBLE? Choose all that apply. A. The

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Question

Which of the following statements are IMPOSSIBLE? Choose all that apply.
A. The rocket's speed was measured to be 1.84c.
B. The rocket's rest length is 402 m. An observer flying by measured the rocket to be 730 m long.
C. A rocket flying away from the Sun at 0.44c measured the speed of the photons (particles of light) emitted by the Sun to be c.
D. An inertial reference frame had an acceleration of 0 m/s2.
E. The proper time interval between two events was measured to be 267 s.The time interval between the same two events (as measured by an observer not in the proper frame) was 372 s.

Explanation / Answer

A and B are impossible.

A) Speed cannot be greater than the speed of light.

B) An observer flying by observes length contraction, i.e. the rocket should be measured to be shorter than its rest length. lo= l/,

= 1/(1-v2/c2)> 1 and is the Lorentz factor

Correct:
C) Photons i.e. light is always measured to have speed c. Can check this using the relativistic formula for addition of speeds.
D) inertial reference frame is one which is not accelerating i.e. 0 m/s^2
E) External observer observes time dilation i.e. observes time intervals longer than the proper time interval. t0=, >1

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Which of the following statements are IMPOSSIBLE? Choose all that apply. A. The

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Which of the following statements are IMPOSSIBLE? Choose all that apply. A. The

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