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SAT® Subject Test in Physics

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Moderate

Identical Boxes

SATPHY-NL11KM

Box 1 and box 2 are identical when at rest relative to each other. An astronaut floating in intergalactic space sees the two boxes fly by from the astronaut's left to his right. Box 1 flies by at $(0.8)c$ ($80\%$ of the speed of light), and box 2 flies by at $(0.9)c$ ($90\%$ of the speed of light).

Because of relativistic effects, what is true from the point of view of the astronaut?

A

Box 2 is longer and taller than box 1.

B

Box 2 is longer and not as tall as box 1.

C

Box 1 is longer and taller than box 2.

D

Box 1 is longer and not as tall as box 2

E

Box 2 Is shorter and the same height as box 1.