Fred and Joanne Both Measure the Length of a Particular

question 79

Multiple Choice

Fred and Joanne both measure the length of a particular spaceship to be 100 m when it is on Earth.Joanne then gets into the spaceship and,after visiting the Moon,hurtles past Earth at a speed close to the speed of light.Fred,still on Earth,measures the length of the moving spaceship to be about 90 m.At the same time,Joanne (using her own meterstick) measures the length of the spaceship to be:

• A) about 90 m because of the motion of the spaceship.
• B) 100 m because she is "at rest" on the spaceship.
• C) about 110 m because both she and the spaceship are moving.
• D) It is not possible to tell from the information given.

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