Q82 · Practice questionComplex familiar4 marks
QUESTION 82 (4 marks)
A rod has proper length and is measured to be long by an observer relative to whom it is moving. Determine the rod’s speed as a fraction of .
WORKED SOLUTION
4 marksPractice marking scheme
ANSWER
.
Worked solution
Length contraction gives
Thus
Squaring:
Therefore .
Uses length-contraction equation.
Forms length ratio.
Solves for squared speed ratio.
Obtains 0.800c.
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