[TheForge] Math

Sat Sep 13 14:17:05 2003

Ene bichizh ogsen baina shuu...

> Michael Wolfe wrote:
> >
> > I need to figure the amount of lean in inches, I would
> > get on a 12 foot post that is leaning 3 degrees.
> > Or if you know the formula for one degree I could
> > figure the actual lean when I go on site and it really
> > is 4.5 degrees...

I'm sure this is far too simple for you students of higher math ;-) but why
not just drop a plumb bob and measure the amount of lean? That way,, you'll
get an accurate measurement of the amount of deflection, regardless of
whether the post is straight or warped, and without having to rely on
possibly-but-not-absolutely-accurate angular measurements...

Saint Phlip,
CoDoLDS

"When in doubt, heat it up and hit it with a hammer."
 Blacksmith's credo.

 If it walks like a duck, and quacks like a duck, it is probably not a
cat.

Never a horse that cain't be rode,
And never a rider who cain't be throwed....

----- Original Message -----
From: "A. Vida" <[email protected]>
To: <[email protected]>
Sent: Saturday, September 13, 2003 2:01 PM
Subject: Re: [TheForge] Math

>
>
>
> Sin(theta) = y/r
>
> We know the angle theta (3*) and the radius vector (12).
>
> Sin(3) == .05234 - give or take
>
> You wish to find the value of y.  Isolating y, multiply both sides of
> the
> equation by r.  r divides out on the right side.
>
> r * sin(theta) = y
>
> 12 * .05234    = y
>
> .628   = y - or about 5/8"
>
>
> Or so the numbers tell me.
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