SAT Subject Physics Practice Question 358: Answer and Explanation

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Question: 358

54. According to Einstein's theory of relativity, which of the following would be a correct assumption to make for a traveler in a spaceship traveling at .95c?

A. Clocks on the spaceship run more slowly.
B. The spaceship will appear shortened.
C. The mass of the spaceship increases while it is in motion.
D. Light travels at the same velocity for the traveler whether he is moving or not moving.
E. All of these assumptions would be correct.

Correct Answer: E


The correct answer is (E). All of the choices are correct. Clocks on the spaceship move more slowly, the length of the spaceship would be contracted, the relativistic mass of the spaceship is greater than the rest mass, and the velocity of light is constant for everyone.

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