A Spear 10 Meters Long Is Thrown at a Relativistic

question 172

Multiple Choice

A spear 10 meters long is thrown at a relativistic speed through a pipe that is 10 meters long (both these dimensions are measured when each is at rest) . When the spear passes through the pipe, which of the following statements best describes what is observed?

• A)The spear shrinks so that the pipe completely covers it at some point.
• B)The pipe shrinks so that the spear extends from both ends at some point.
• C)Both shrink equally so the pipe just barely covers the spear at some point.
• D)any of these, depending on the motion of the observer (moving with the spear, at rest with the pipe, etc.)
• An observer fixed to the pipe would measure the mass of the spear to be greater than when at rest; an observer moving with the spear would measure the mass of the pipe to be
• E)more than when at rest.
• F)less than when at rest.
• G)the same as when at rest.

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