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September 18, 2014

September 18, 2014

Posted by **Sara** on Tuesday, December 15, 2009 at 2:08pm.

- Physics -
**Sara**, Tuesday, December 15, 2009 at 2:12pmi know that i could multiply by the number of second to figure out how many miles it traveled for that time but i don't know where to go from there.

- Physics -
**MathMate**, Tuesday, December 15, 2009 at 2:51pmFirst convert the speed of sound (343m/s) to miles per second.

For all practical purposes, we can consider the time it takes the lightning to reach the observer as negligible.

So the number of seconds the observer counted,*multiplied*by the speed of sound (in miles / second) will be the distance, in miles.

If the number of seconds is to be*divided*, then it should be divided by the reciprocal of the speed of sound, namely in seconds/mile.

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