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*Subject*: RE: [amsat-bb] 400N P3D Rocket*From*: Tony Langdon <tlangdon@xxxxxxxxxxxxxxxxxx>*Date*: Thu, 28 Sep 2000 09:07:32 +1000

> >At the risk of embarrasing myself, here's my calculated: > >(snip) > > Exactly right. It's high school physics (Newton's 2nd Law, > f = ma). I don't see why it's viewed as mysterious. > Especially in a supposedly technically-savvy group like > this one. > > Missing yet another deep and mysterious point, I suppose... :-) Normally, one would say "not exactly rocket science", but this is the very principle of rockets. :) While we're on a roll, let's see how long it takes to do the 1/4 mile. I'll be a bit metric, for the sake of simplicity, and do the calculation over 400 metres (which is within 10' of a real 1/4 mile). >From previous calculations, we know: u (initial speed) = 0 m/s a = 400/115 = 3.478 m/s^2 s = ut + 1/2at^2 For a standing start, this (u=0), this simplifies to: s = 1/2 at^2 Solving for t, gives t = sqrt (2s/a) Substituting the values t = sqrt (2 x 400 / 3.478) t = sqrt (230), = 15.165 seconds Not quite a dragster. :-) ---- Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA. To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org

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