A sprinter named Ben has challenged a beam of light to a race in the 100-meter dash. The race is held in a stadium full of spectators. At the start signal, a laser beam is turned on at the start line, pointed down the track

At the same instant, Ben bursts out of the starting blocks at 99% of the speed of light (0.99c). According to the spectators watching in the stands, what happens? (Assume they could somehow watch a slow-motion replay to see what occurred.) A) The light beam wins the race, but barely—it is going 1% of the speed of light faster than him.
B) The light beam instantly finishes the race, before Ben even has a chance to start.
C) The light beam wins the race by a large margin because it is going faster than him by the full speed of light.
D) Ben beats the light beam to the finish line, becoming a hero.


A

Physics & Space Science

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You are originally 1.0 m beneath the surface of a pool. If you dive to 2.0 m beneath the surface, what happens to the absolute pressure on you?

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