Chronology Current Month Current Thread Current Date
[Year List] [Month List (current year)] [Date Index] [Thread Index] [Thread Prev] [Thread Next] [Date Prev] [Date Next]

Re: Heating tape



--=====================_22614415==_.ALT
Content-Type: text/plain; charset="us-ascii"


At 09:01 PM 10/8/98 -0400, Herbert H Gottlieb wrote:
coefficient of expansion. It shouldn't be hard to adapt it as a lab
where the students can carry out quantitative measurements. It consists
of a
long aluminum rod fixed at one end with a bench clamp. The other end
rests etc.

There is a variation on this demo that replaces the pointer with a small
mirror
attached to a needle which the rod rests upon. You reflect a laser off the
mirror onto the wall. When you heat the rod, the expanison rotates the
needle/mirror assembly and the laser spot on the wall will move
dramatically.

I've done it both ways, but the laser seems to have the greater "wow" factor.

Glenn Knapp
-----------------------------------------------------------------
Physics Kahuna
Kahuna Physics Institute - on the flapping edge of physics research.
--=====================_22614415==_.ALT
Content-Type: text/html; charset="us-ascii"

<html><div>At 09:01 PM 10/8/98 -0400, Herbert H Gottlieb wrote:</div>
<div>&gt;&gt;coefficient of expansion. It shouldn't be hard to adapt it
as a lab </div>
<div>&gt;&gt;where the students can carry out quantitative measurements.
It consists</div>
<div>&gt;of a </div>
<div>&gt;&gt;long aluminum rod fixed at one end with a bench clamp. The
other end</div>
<div>&gt;rests etc.</div>
<br>
<div>There is a variation on this demo that replaces the pointer with a
small mirror attached to a needle which the rod rests upon.&nbsp; You
reflect a laser off the mirror onto the wall.&nbsp; When you heat the
rod, the expanison rotates the needle/mirror assembly and the laser spot
on the wall will move dramatically.&nbsp; </div>
<br>
<div>I've done it both ways, but the laser seems to have the greater
&quot;wow&quot; factor.</div>
<br>
Glenn Knapp
<br>

<font face="Times New Roman, Times" size=4>-----------------------------------------------------------------<br>
</font><font size=3>Physics Kahuna<br>
Kahuna Physics Institute - on the flapping edge of physics research.
</font></html>

--=====================_22614415==_.ALT--