Re: [asa] writing equations - a request

With perfect reflectors &c - again this is an ideal Gedankenexperiment - all
the rays emitted by the iron should go to the other focus.

But ray optics is only an approximation.

Shalom
George
http://web.raex.com/~gmurphy/
----- Original Message -----
From: "Bill Hamilton" <williamehamiltonjr@yahoo.com>
To: "George Murphy" <gmurphy@raex.com>; "ASA list" <asa@calvin.edu>; "Janice
Matchett" <janmatch@earthlink.net>
Sent: Thursday, July 20, 2006 3:09 PM
Subject: Re: [asa] writing equations - a request

> What about
> the heat energy that is disipated from the iron into the clothes
> the heat energy that is absorbed by the air between the two irons
> the heat energy that is absorbed by objects in the room (including the
> person doing the ironing)
> ???
>
> --- George Murphy <gmurphy@raex.com> wrote:
>
>> Sort of, but the connection is pretty remote.
>>
>> The thrifty owners of the laundry have constructed their building in the
>> form
>> of an ellipsoid, and put irons at both foci. All the radiation from an
>> instrument at one focus as it irons clothes is reflected to the other
>> focus
>> (by a well known property of the ellipse) & heats the other iron, which
>> can
>> then be used to iron other clothes. No heat is lost & no money needs to
>> be
>> spent in heating the irons once they've been heated up initially.
>>
>> What's wrong with this picture?
>>
>> (Of course an iron - whether a "mangle" or the usual household variety -
>> isn't a mathematical point but that's not the "point" here.)
>>
>> Shalom
>> George
>> http://web.raex.com/~gmurphy/
>> ----- Original Message -----
>> From: Janice Matchett
>> To: George Murphy ; ASA list
>> Sent: Thursday, July 20, 2006 12:17 PM
>> Subject: Re: [asa] writing equations - a request
>>
>>
>> At 11:27 AM 7/20/2006, George Murphy wrote:
>>
>>
>> A teaser: How many know "The paradox of the Chinese laundry"?
>>
>>
>> @ Physicists know that we don't live in a frictionless world, so does
>> it
>> have anything to do with a lack of friction?
>>
>> ~ Janice
>>
>>
>>
>>
>
>
> Bill Hamilton
> William E. Hamilton, Jr., Ph.D.
> 248.652.4148 (home) 248.821.8156 (mobile)
> "...If God is for us, who is against us?" Rom 8:31
>
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Received on Thu Jul 20 15:37:32 2006