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Strategies & Market Trends : MDA - Market Direction Analysis
SPY 689.17+0.2%Dec 11 4:00 PM EST

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To: Webster Groves who wrote (73842)4/2/2001 9:05:37 AM
From: Zardoz  Read Replies (1) of 99985
 
F = F(up) + F(down)
Why rockets go up? F(up) = v dm/dt (stuff shoots out the back)
Why rockets do down? F(down) = Mg (g is gravity and says so).

Try
d/dt{mgh+ 1/2xmv^2)+d/ds(mgh+1/2xmv)C + F1 + d/dt{Mgh+ 1/2xMV^2)+ d/ds(Mgh+1/2xMV)C = 0

Actually your wrong, and Ahhaha was more right. You assume incorrectly that Gravity is a constant all the way to the end of outer space. Yet since it's variant due to range from the source, then your equation becomes useless. Anyways, Rocket science is based on a 4th order rieman field, and thus is not linear as ahhaha states.

F:= massxGravitational flux+ mass flow rateXvelocity
and when the velocity of the mass is of the order of ion being propelled at 95% the speed of light, it becomes VERY relativist. And then you must take into account the Herman Weyl conditions that ALL energy give off a gravitation field {and since EM fields are energy, as well as light} then you have a 4th order+ equations. Which is why Light bends around gravitational masses and why if you are to shoot only electrons from a rocket, you actually go nowhere.... Therefore Newtonian Mechanics is useless....

Now onto Ahhaha:
You doubt gravitation is indistinguishable from acceleration? Consult the Equivalence Principle.
That only a principle and is thus useless. And YES Gravity is VERY different to acceleration. Even in Einstein's mind experiment he stated that one could distinguish the difference by the Neutrino field passing through the base of the Elevator. If they are parallel, you're accelerating... and if they converge you're in a gravitational field.

Hutch
PS: I could go on for hours more and several more variables... like when a rocket becomes in orbit.
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