P18_003

# P18_003 - d 1 = v t 1 = (343 m / s)(0 . 23 s) = 79 m. The...

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3. (a) The time for the sound to travel from the kicker to a spectator is given by d/v ,whe re d is the distance and v is the speed of sound. The time for light to travel the same distance is given by d/c , where c is the speed of light. The delay between seeing and hearing the kick is ∆ t =( d/v ) ( d/c ). The speed of light is so much greater than the speed of sound that the delay can be approximated by ∆ t = d/v . This means d = v t .
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Unformatted text preview: d 1 = v t 1 = (343 m / s)(0 . 23 s) = 79 m. The distance from the kicker to the second spectator is d 2 = v t 2 = (343 m / s)(0 . 12 s) = 41 m. (b) Lines from the kicker to each spectator and from one spectator to the other form a right triangle with the line joining the spectators as the hypotenuse, so the distance between the spectators is D = p d 2 1 + d 2 2 = p (79 m) 2 + (41 m) 2 = 89 m....
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