"Andrew Coppin" <orp### [at] btinternetcom> wrote in message
news:3fb53d4c$1@news.povray.org...
> OK, a few things:
>
> * What is the volume of a sphere of radius R?
4/3*pi*r^2

> * Anyone know the approximate density of iron?
~17/60 #/in^3

> #declare SA = sphere {<0, 0, 0>, 1}
> #declare SB = sphere {<+8, 0, 0>, 1}
>
> SA is stationary. SB is travelling along the X-axis. Since the two have
> equal mass (no, they do, cos it's my universe and I SAID SO :-), when SB
> hits SA, SB will come to a complete stop, and SA will continue on with
> (roughly?) the same velocity as SB had.
>
> How suppose we change the start conditions:
>
> #declare SA = sphere {<0, 0, 0>, 1}
> #declare SB = sphere {<+8, +0.2, 0>, 1}
>
> Unless I'm horribly mistaken, SB should bounce off SA at an angle (WHICH
> angle??), transferring only some (HOW MUCH?) of its momentum to SA.
>
> Anyone care to add details?

don't have momentum eqs on hand, but the best way to deal with it is to
resolve the momentum of each object into global x,y and z components first,
then apply momentum transfer to each.

-tgq

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