Past exam of the mathematics course of the University of Cambridge / 2002 / ib / Paper 4 / 18D / a

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- Solution a

Solution

The Lorentz factor is

γ = (1 - 0. 8^{2})^{- 1/2} = 5/3

. Length contraction makes the moving javelin's length in the shed frame

L = 2/ γ = 1.2 m .

This measures its two endpoints at the same shed-frame time.

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