Question

A spaceship, 250 m long as seen on board, moves by the earth at 0.930c. What is its length (in m) as measured by an earth-bound observer?

Answer 1

L = Lo (1 - (V/c)^2)^1/2 contracted length when proper length is Lo

L = 250 m * (1 - .93^2)^1/2 = 250 m * .368 = 91.9 m