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Phys5April1_09

# Phys5April1_09 - Q37.2 As a high-speed spaceship flies past...

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A. reaches point A before it reaches point B. B. reaches point B before it reaches point A. C. reaches points A and B simultaneously. Q37.2. As a high-speed spaceship flies past you at half the speed of light, a strobe light fires at the center of a room aboard the spaceship. As measured by you , the light from the strobe

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A. reaches point A before it reaches point B. B. reaches point B before it reaches point A. C. reaches points A and B simultaneously. Q37.2. As a high-speed spaceship flies past you at half the speed of light, a strobe light fires at the center of a room aboard the spaceship. As measured by you , the light from the strobe
t =0 : light flashes at center of room on ship. Point B is at x=0. A B + Your reference frame: ship moves at speed 0.5 ct . v ship = 0.5 c x=0 O y x

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Time t later : Ship has moved a distance of 0.5 ct, in the +x direction. Light has travelled out in all directions, a distance of ct. So the light travelling in the minus x direction reaches point B first. The light travelling in the + x direction will catch up with point A later.
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