mayuwei78
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PLEASE SOVEL THIS I WILL GIVE OUT 20 POINT
A jet is traveling at 720 mph towards a thunderstorm. At the start the pilot sees a bolt of lighting, the jet is 8 ½ miles away from the storm. How long until the pilot hears and thunder from the lightning bolt? (That sound takes 5 seconds to travel a mile)

Sagot :

sqdancefan

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Answer:

  21.25 seconds

Step-by-step explanation:

In miles per second, the speed of the jet is ...

  (720 mi/h)/(3600 s/h) = 1/5 mi/s

The speed of the sound is the same:

  (1 mi)/(5 s) = 1/5 mi/s

Then the rate of closure between the airplane and the sound is ...

  (1/5 mi/s) +(1/5 mi/s) = 2/5 mi/s

To find the time required to close a gap of 8 1/2 miles, we can use the relation ...

  time = distance/speed

  time = (8.5 mi)/(0.4 mi/s) = 21.25 s

The pilot will hear the thunder 21.25 seconds after the flash.

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