<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META content=text/html;charset=iso-8859-1 = http-equiv=Content-Type> <META content="MSHTML 5.00.2722.1300" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face=Arial size=2>My dear friends</FONT></DIV> <DIV> </DIV> <DIV><FONT face=Arial size=2>The potential energy in the spring is = no energy. The spring in its released state has no energy, you store energy in the = spring when you press it, and that energy is released as the spring gets back = to its original shape. </FONT></DIV> <DIV> </DIV> <DIV><FONT face=Arial size=2>If you have the adequate means or = equipment you will notice that each time you press the spring its temperature will = rise a little, here we are referring to kinetic energy, totally different to = the chemical one involving acid. </FONT></DIV> <DIV> </DIV> <DIV><FONT face=Arial size=2>Now when you put the spring into acid = you get a chemical reaction, and it is based on the materials ability to react. If = the spring was made of an acid resistant plastic it would still have the = ability of storing kinetic energy, but nothing would happen when dipped in acid. = Piano jack springs are metal which reacts with acid so you get a chemical reaction = out of them also</FONT></DIV> <DIV> </DIV> <DIV><FONT face=Arial size=2>Elian</FONT></DIV> <BLOCKQUOTE style="BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: = 0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px"> <DIV style="FONT: 10pt arial">----- Original Message ----- </DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: = black"><B>From:</B> <A href="mailto:bholden@wave.co.nz" title=bholden@wave.co.nz>Brian = Holden</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A = href="mailto:pianotech@ptg.org" title=pianotech@ptg.org>Pianotech Forum</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> Sunday, November 21, 1999 = 3:53 PM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Jack Spring = experiment</DIV> <DIV><BR></DIV> <DIV><FONT color=#000000 size=2>I confess that I haven't actually = done this, but consider taking a handful of jack springs and squashing them into = a small jar containing hydrochloric acid (let 'em know whose the boss).  = Somehow screw on the lid without the little beasties springing back out and = splashing the acid over your hands.  Observe the springs being slowly = dissolved away by the acid.  </FONT></DIV> <DIV><FONT color=#000000 size=2></FONT> </DIV> <DIV><FONT color=#000000 size=2>Question (which I'm not entirely = sure what the answer is):  Where does the potential energy go that was = contained in the squashed springs?  Newton said that energy must go somewhere, but = in this case - where?  Brian Holden, BSc and piano tuner NZ.  </FONT></DIV></BLOCKQUOTE></BODY></HTML>