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Suppose the straight-line distance between New York and San Francisco is 4.4 106 m (neglecting the curvature of the earth). A UFO is flying between these two cities at a speed of 0.69c relative to the earth. What do the voyagers aboard the UFO measure for this distance?

  • physics -

    =4.4•10⁶•sqrt{1-0.69²}=3.2•10⁶ m

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