Two Spaceships Approach Earth from the Same Direction

question 91

Multiple Choice

Two spaceships approach Earth from the same direction. One has a speed of 0.21c and the other a speed of 0.34c, both relative to Earth. What is the speed of one spaceship relative to the other?

• A) 0.18c
• B) 0.16c
• C) 0.14c
• D) 0.13c
• E) 0.15c

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Definitions:

Gauge

In film, refers to the width of the film stock and its perforations, dictating the type of equipment needed for projection. Common gauges include 8mm, 16mm, 35mm, and 70mm.

Resolution

The ability of a camera lens to define images in sharp detail.

Lumière Brothers

Pioneers of the film industry, noted for their invention of the Cinématographe and for holding the first public movie screening in 1895.

Photogénie

A cinematic concept that suggests certain objects or faces are imbued with an essence that makes them particularly suited to filmic representation.