Re: [asa] writing equations - a request

The clothes and the ironing board are not point sources, so their reradiation
is not reflected back to the other focus. + as others have said the reradiation
is at a lower temperature.

--- George Murphy <gmurphy@raex.com> wrote:

> Sure, but the clothes & the ironing borad then re-radiate energy.
>
> 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 8:30 PM
> Subject: Re: [asa] writing equations - a request
>
>
> >I _still_ say that energy from the irons is absorbed by the clothes being
> > ironed and therefore not available for heating thee other iron. In
> > addition,
> > the iron must rest on an ironing board, which would prevent some of the
> > radiation from reaching the ellipsoid.
> >
> > --- George Murphy <gmurphy@raex.com> wrote:
> >
> >> 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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> >> >
> >>
> >>
> >> To unsubscribe, send a message to majordomo@calvin.edu with
> >> "unsubscribe asa" (no quotes) as the body of the message.
> >>
> >
> >
> > 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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> >
> > To unsubscribe, send a message to majordomo@calvin.edu with
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> >
>
>

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 Fri Jul 21 08:38:13 2006