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Subject: Re: [lojban] Re: Direction of Rotation
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On Sat, Aug 11, 2012 at 10:11 AM, djandus <jandew@gmail.com> wrote:

> I don't have time to go over every post in this thread, especially seeing
> as it is rather full of people getting offended.
>
> Has anyone brought up the right-hand rule? (for rotations)
>
> That is, for the wheels on a car, I could say:
> {lo karce xislu cu carna zo'e lo zunle be lo karce}
> because if you were to stick your right thumb to the car's left, your
> fingers would curl around in the direction of rotation. This is consistent
> with the overall standard of the right-hand rule, which comes up on this
> topic via the cross product definition of angular motion. That is, if I
> were to be asked the "direction" of the angular motion, momentum, or
> similar, it would be to the car's left. This *is* arbitrary, but
> completely standardized in physics.
>

I believe Pierre did, yes.


> Similarly, I would say that a top would be {carna zo'e lo gapru} if it
> were spinning counter-clockwise when viewed from above. If I were to
> instruct one to remove a screw, I could say {ko cargau lo klupe ku zo'e lo
> bartu}, because the direction a screw moves and the direction it needs to
> rotate correspond by the same standard right-hand rule. If I were to use
> the carna2 spot, the axis would probably be defined with a direction as
> "positive," after which I could then use {li ni'u}/{li ma'u} in carna3.
> (This would be the establisment of a coordinate system.) If the axis was
> given descriptively without a direction, then my other examples illustrate
> how I would deal with that.
>
> Is there anything terribly wrong with these examples?
> mu'o mi'e djos
>

I don't see anything.

-- 
mu'o mi'e .aionys.

.i.e'ucai ko cmima lo pilno be denpa bu .i doi.luk. mi patfu do zo'o
(Come to the Dot Side! Luke, I am your father. :D )

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<br><br><div class=3D"gmail_quote">On Sat, Aug 11, 2012 at 10:11 AM, djandu=
s <span dir=3D"ltr">&lt;<a href=3D"mailto:jandew@gmail.com" target=3D"_blan=
k">jandew@gmail.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quo=
te" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"=
>
I don&#39;t have time to go over every post in this thread, especially seei=
ng as it is rather full of people getting offended.<div><br></div><div>Has =
anyone brought up the right-hand rule? (for rotations)</div><div><br></div>
<div>That is, for the wheels on a car, I could say:</div><div>{lo karce xis=
lu cu carna zo&#39;e lo zunle be lo karce}</div><div>because if you were to=
 stick your right thumb to the car&#39;s left, your fingers would curl arou=
nd in the direction of rotation. This is consistent with the overall standa=
rd of the right-hand rule, which comes up on this topic via the cross produ=
ct definition of angular motion. That is, if I were to be asked the &quot;d=
irection&quot; of the angular motion, momentum, or similar, it would be to =
the car&#39;s left. This <i>is</i>=A0arbitrary, but completely standardized=
 in physics.</div>
</blockquote><div><br>I believe Pierre did, yes.<br>=A0</div><blockquote cl=
ass=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;p=
adding-left:1ex"><div></div><div>Similarly, I would say that a top would be=
 {carna zo&#39;e lo gapru} if it were spinning counter-clockwise when viewe=
d from above. If I were to instruct one to remove a screw, I could say {ko =
cargau lo klupe ku zo&#39;e lo bartu}, because the direction a screw moves =
and the direction it needs to rotate correspond by the same standard right-=
hand rule. If I were to use the carna2 spot, the axis would probably be def=
ined with a direction as &quot;positive,&quot; after which I could then use=
 {li ni&#39;u}/{li ma&#39;u} in carna3. (This would be the establisment of =
a coordinate system.) If the axis was given descriptively without a directi=
on, then my other examples illustrate how I would deal with that.</div>
<div><br></div><div>Is there anything terribly wrong with these examples?</=
div><div>mu&#39;o mi&#39;e djos</div></blockquote><div><br>I don&#39;t see =
anything. <br></div></div><br>-- <br>mu&#39;o mi&#39;e .aionys.<br><br>
.i.e&#39;ucai ko cmima lo pilno be denpa bu .i doi.luk. mi patfu do zo&#39;=
o<br>(Come to the Dot Side! Luke, I am your father. :D )<br><br>

<p></p>

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