A 10-Meter-Long Spear Is Thrown at Relativistic Speeds Through a 10-Meter-Long

question 36

Multiple Choice

A 10-meter-long spear is thrown at relativistic speeds through a 10-meter-long pipe.(Both these dimensions are measured when each is at rest. ) When the spear passes through the pipe,which of the following statements is true?

• A)The spear appears to shrink so the pipe completely covers it.
• B)The pipe appears to shrink so the spear extends from both ends.
• C)Both appear to shrink equally so the pipe barely covers the spear.
• D)any of these,depending on the motion of the observer (moving with the spear,at rest with the pipe,and so on).
• E)none of these

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