A Child on a Playground Swing Is Swinging Back and Forth

question 69

Multiple Choice

A child on a playground swing is swinging back and forth (one complete oscillation) once every 4 seconds, as seen by her father standing next to the swing. At the same time, a spaceship is hurtling by at a speed close to the speed of light. According to special relativity (and ignoring the Doppler effect for this question) , her mother on the spaceship finds that the time for one full swing is

• A) less than 4 seconds when the spaceship is approaching the swing and more than 4 seconds when it is moving away.
• B) less than 4 seconds.
• C) equal to 4 seconds.
• D) more than 4 seconds.

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