"waggy" <hon### [at] handbasketorg> wrote:
>
> Don't forget to calculate and then add the tangential velocity (v_tan) vector to
> the total velocity (v) vector when computing F_track.

I forgot to mention that I usually make *lots* of mistakes as I work through a
problem, and this looks like one of them.  The component of the side-to-side
swinging velocity in the direction of the track should be zero, so forget about
this.

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