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*Subject*: RE: [amsat-bb] 400N P3D Rocket*From*: Tony Langdon <tlangdon@xxxxxxxxxxxxxxxxxx>*Date*: Thu, 28 Sep 2000 08:35:59 +1000

> whlie looking at the P3D pictures, i noticed the one of dick daniels > holding the 400 Newton rocket in his hands. it made we wonder > just how much > power is 400N. to satisfy my curiosity i'd thought i'd ask so > here goes: > between me and my bicycle we weigh 115 Kg. if i were to strap > on the P3D > 400N rocket to my bicycle, how long would it take me to > accelerate from a > zero to 100 kilometers per hour (assume no friction and a > level surface)? > thanks in advance. Forgot to do the speed check, so here it is. :-) Mass = 115 kg (have to assume the rocket motor is included in this figure, or a way to transfer the force to the bicycle without the motor being on board is used, to make the problem solveable here - anyone know the mass of the 400N motor and fuel?) Assuming no friction or wind resistance (not realistic, but makes it easier to work out). Initial speed = 0 km/h (0 m/s) Final speed = 100 km/h (27.778 m/s) Firstly, the acceleration - F =ma, so a = f/m, = 400/115, or 3.478 m/s^2 (this is a little over 1/3 G - 1G = 9.81 m/s^2) v = u + at. Solving for t, gives t = (v - u)/a Substituting in the real figures... t = (27.778 - 0)/3.478 t = 7.986 seconds for 0-100. In the same ballpark as many cars! :-) So, P3D's main motor on a bicycle gives sports car like performance on the straights. :-) ---- 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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