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Re: Irma's Projected Path 

By: Decomposed in POPE IV | Recommend this post (1)
Wed, 06 Sep 17 12:42 AM | 101 view(s)
Boardmark this board | POPES NEW and Improved Real Board 		Msg. 33147 of 47202
(This msg. is a reply to 33146 by monkeytrots)
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mt: 

re: "Energy is directly proportional to the SQUARE of the speed"

Yep. You're right. I should have remembered that.

Like your "car stopping distance" experiment, I've seen one involving ball bearings falling into fine sand. If the ball bearing's speed doubles, it goes four times as deep.

Correct me if I'm wrong, but doubling the speed of wind should therefore MORE than quadruple its force. More molecules per second and vastly more energy per molecule.

Squaring of speed to determine energy ties directly to Einstein's E=mc² formula, btw - in which, again, the energy derived is a function of the square of the speed.

Thanks for catching my gaff.
 





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The above is a reply to the following message:
Re: Irma's Projected Path
By: monkeytrots in POPE IV
Tue, 05 Sep 17 11:28 PM 		Msg. 33146 of 47202

>> That's because not only are the molecules of air moving twice as fast, but in a given period of time, twice as many of them strike.

That seemed to make perfect sense ... on first take. But it caused me to do a double take, 'cuz i'd never heard that particular explanation given.

Physics kicked in .... Energy is directly proportional to the SQUARE of the speed - irrespective of the mass (ie. number of molecules) involved. This can be seen in the case of braking distance verses speed (constant mass - no change in the number of molecules). Table below below - check the distance for braking (after reaction time) for vehicle at 30 mph vs. 60 mph- 4x the distance for twice the velocity. E = 1/2*mass*velocity*velocity


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