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fire_breeze said:
And for the scientific explanation if my memory serves correctly, when you see lightning, you start counting until you hear thunder and the secinds tells you the kilometres the storm is away.
Click to expand...

miles is what I always thought
 
sno_22 said:
miles is what I always thought
Click to expand...

The speed of sound is roughly 0.22 miles per second (770 mph/3600 sec/hr), so neither one kilometer or one mile persecind from the time you see the lightning to when you hear the thunder.
 
Okay, I looked it up... sound travels at 332 m/s (metres/second)
And if I count more than 3 seconds, that would be just under one kilometre...
4 seconds, 1.3km... :rolleyes:

you can say it....
 
Everyone is looking this up...I found the following, although who knows if it's all right or not...

Watch the sky for a flash of lightning.

Count the number of seconds until you hear thunder. If you have a watch with a second hand or a digital watch that has seconds, begin timing as soon as you see the lightning and stop as soon as you hear the thunder start. If you don’t have a watch, do your best to count the seconds accurately. Say "One one thousand, two one thousand etc." in your mind for each second.

Divide the number of seconds by 5 to calculate the distance in miles (or divide by 3 for kilometers). In other words if you counted 18 seconds from when you saw the lightning, the strike was 3.6 miles (6 kilometers) from your location. The delay between when you see lightning and when you hear thunder occurs because sound travels much, much more slowly than light. Sound travels through air at about 1100-1200 feet (330-350 meters) per second (depending on altitude, relative humidity, pressure, etc.), which is a little more than one mile per five seconds (one kilometer per three seconds). In comparison, the speed of light is 983,571,058 feet (299,792,458 meters) per second.
For example, if lightning strikes a point 1 mile away, you will see the strike approximately .00000536 seconds after the strike while you will hear it approximately 4.72 seconds after the actual strike. If you calculate the difference between these two experiences, a person will hear a strike approximately 4.71999 seconds after the strike actually occurred. Therefore, 5 seconds per mile is a fairly robust approximation.
 
sno_22 said:
Everyone is looking this up...I found the following, although who knows if it's all right or not...

Watch the sky for a flash of lightning.

Count the number of seconds until you hear thunder. If you have a watch with a second hand or a digital watch that has seconds, begin timing as soon as you see the lightning and stop as soon as you hear the thunder start. If you don’t have a watch, do your best to count the seconds accurately. Say "One one thousand, two one thousand etc." in your mind for each second.

Divide the number of seconds by 5 to calculate the distance in miles (or divide by 3 for kilometers). In other words if you counted 18 seconds from when you saw the lightning, the strike was 3.6 miles (6 kilometers) from your location. The delay between when you see lightning and when you hear thunder occurs because sound travels much, much more slowly than light. Sound travels through air at about 1100-1200 feet (330-350 meters) per second (depending on altitude, relative humidity, pressure, etc.), which is a little more than one mile per five seconds (one kilometer per three seconds). In comparison, the speed of light is 983,571,058 feet (299,792,458 meters) per second.
For example, if lightning strikes a point 1 mile away, you will see the strike approximately .00000536 seconds after the strike while you will hear it approximately 4.72 seconds after the actual strike. If you calculate the difference between these two experiences, a person will hear a strike approximately 4.71999 seconds after the strike actually occurred. Therefore, 5 seconds per mile is a fairly robust approximation.
Click to expand...

Works for me. .2 sec/mile = one mile in 5 secs.
 
sno_22 said:
Everyone is looking this up...I found the following, although who knows if it's all right or not...

Watch the sky for a flash of lightning.

Count the number of seconds until you hear thunder. If you have a watch with a second hand or a digital watch that has seconds, begin timing as soon as you see the lightning and stop as soon as you hear the thunder start. If you don’t have a watch, do your best to count the seconds accurately. Say "One one thousand, two one thousand etc." in your mind for each second.

Divide the number of seconds by 5 to calculate the distance in miles (or divide by 3 for kilometers). In other words if you counted 18 seconds from when you saw the lightning, the strike was 3.6 miles (6 kilometers) from your location. The delay between when you see lightning and when you hear thunder occurs because sound travels much, much more slowly than light. Sound travels through air at about 1100-1200 feet (330-350 meters) per second (depending on altitude, relative humidity, pressure, etc.), which is a little more than one mile per five seconds (one kilometer per three seconds). In comparison, the speed of light is 983,571,058 feet (299,792,458 meters) per second.
For example, if lightning strikes a point 1 mile away, you will see the strike approximately .00000536 seconds after the strike while you will hear it approximately 4.72 seconds after the actual strike. If you calculate the difference between these two experiences, a person will hear a strike approximately 4.71999 seconds after the strike actually occurred. Therefore, 5 seconds per mile is a fairly robust approximation.
Click to expand...

*sigh*

This sounds very much what I remembered reading a few years ago...
 
OK. So after re-reading the question here is a complete answer:

3. Count the seconds between when you heaqr the thunder and see the lightning. Multiply by 0.2 seconds. Your answer is the distance of the lightning from where you are in miles.
 
Hate to do it, since I'm tied with the nerdy one :)

but I have work in the morning, night all.


And thanks much for the stimulation liz, mental that is :D
 
elizabeth22673 said:
Let's continue shall we?

Charles Pompuss was racing around in his new sports car when he noticed that his throat was parched. He came to a screeching halt in front of the 'Soul-Ace Hotel' and the nine police cars which had been chasing him, slammed into the back of his car and each other's.

How many bumpers will have been hit?
Click to expand...

Liz, I have a point of reference to this question. If your question is correct, the answer is 9, for each of the receiving bumpers. The other 9 are doing the hitting, therefore they have not "been hit". I know, picky, huh?
 
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