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Space pilot Mavis zips past Stanley at a constant speed relative to him of 0.800. Mavis and Stanley start timers at zero when the front of Mavis’s ship is directly above Stanley. When Mavis reads 5.00 on her timer, she turns on a bright light under the front of her spaceship.
Use the Lorentz coordinate transformation to calculate as measured by Stanley for the event of turning on the light. Use the time dilation formula to calculate the time interval between the two events (the front of the spaceship passing overhead and turning on the light) as measured by Stanley. Multiply the time interval by Mavis’s speed, both as measured by Stanley, to calculate the distance she has traveled as measured by him when the light turns on.