Re: Is temperature relative?

Re-read your post, decided I should post a more appropriate response.

See also <pan.2005.08.23.14.35.56.575676@xxxxxxxxxx>


On Sat, 20 Aug 2005 08:00:08 -0700, N:dlzc D:aol T:com (dlzc) wrote:

> Dear sal:
>
> "sal" <pragmatist@xxxxxxxxxx> wrote in message
> news:pan.2005.08.20.12.46.44.237951@xxxxxxxxxxxxx
>> On Fri, 19 Aug 2005 21:50:08 -0700, N:dlzc D:aol T:com (dlzc) wrote:
> ...
>>> You have defined things rather loosely.
>>
>> Not at all. Read it again.
>>
>>> The gamma formula
>>
>> 1/sqrt(1-v^2) -- rather standard, actually.
>
> Put a value inclusive of 0, not inclusive of 1, for v. What value
> do you get for g? Now look at how you are applying this factor
> between moving and stationary frames. This is a first-grader error
> you are making, to confuse yourself. The domain of g is 1 <= g <
> oo.

I re-read this a few days later and I still don't see what you're
trying to get at.

If you were trying to say the E field should, in this particular case,
transform as

E' = E/g

not as

E = E'/g

because you need to transform from the moving frame to the lab frame,
why didn't you just say so?

And if that's not what you were trying to say, then what was the
point you were making?

> ...
>> Actually, Lx' = g*Lx, not (1/g)*Lx (things "contract" as seen from
>> the stationary frame, not the other way around, of course), but
>> let's stick with the perpendicular case for now, OK? Length along
>> the Y axis, with motion along X axis.
>>
>> Ly' = Ly. Transverse lengths are not affected. This is basic SR.
>>
>> I'll snip the rest -- get the Lorentz transform of the E field
>> straight and try again.

Indeed that was the source of the error.


> You could look at a simple "rectangular" capacitor, rather than a
> resistor. Easier to picture. For travel along the
> plate-separation-distance, and for travel parallel to one of the
> plate-area-dimensions.

Yes, that's correct. It makes it clearer that B can be zero (or
small) in the moving frame and necessarily nonzero in the laboratory
frame.


--
Nospam becomes physicsinsights to fix the email

.

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