An astronaut on a spaceship traveling at 0.75c relative toEarth measures his ship to be 23 m long. On the ship, heeats his lunch in 28 min. (a) What length is the spaceshipaccording to observers on Earth? (b) How long does theastronaut’s lunch take to eat according to observers on Earth?

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Q: Suppose a cosmic ray colliding with a nucleus in the Earth's upper atmosphere produces a muon that…

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