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*From*: Bernard Cleyet <anngeorg@PACBELL.NET>*Date*: Thu, 5 Feb 2004 09:19:14 -0800

Science Fair:

Alissa Schunter The Effects Of Gravity And Air Resistance On The

Trajectory Of A Bullet Junior Mathematics & Computer Sciences Boltz

Junior High School

I'll continue searching 'till someone else comes up w/ the equations --

I'm certain it's easy de nuovo. Just add a -coefficient(v^2) in the

direction of motion to the parametric equations.

In searching I found the claim that grosse Bertha was inaccurate until

the trajectory was assumed an ellipse instead of a parabola.

bc

Ludwik Kowalski wrote:

The Interactive Physics, as I recall, gives one a

crude way of controlling air resistance. Thus one

can collect data by simulating experiments. Then

one can try to describe the data with a formula,

or test a preexisting formula. For real data one

should consult artillery manuals, I suppose.

Ludwik Kowalski

On Thursday, February 5, 2004, at 09:10 AM, Ludwik Kowalski wrote:

What Alex wants, probably, is a formula which

gives the value of the air resistance coefficient

as a function of an asymmetry parameter, such

"the optimal launch angle," or "the difference

between the ideal and real ranges." I have

not seen such formulas.

Ludwik Kowalski

On Thursday, February 5, 2004, at 08:12 AM, Brian Whatcott wrote:

As a straw man, I will offer as a measure, the optimal launch angle

for maximum range.

Brian W

At 05:03 PM 2/4/2004, you wrote:

In projectile motion without resistance the path is a parabola.Brian Whatcott Altus OK Eureka!

With resisatance, the path is asymetric. Is there a standard way to

measure that asymetry? Can that measure be analytically related to

the

the resistance?

ce

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