The fictional rocket ship adventure is measured to be 65m long by the ship's captain inside the rocket. when the rocket moves past a space dock at 0.5c. as rocket ship adventure passes by the space dock, the ship's captain flashes a flashlight at 1.40-s intervals as measured by space-dock personnel.
how often does the flashlight flash relative to the captain?
express your answer to two significant figures and include the appropriate units.
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