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<DIV dir=ltr align=left><SPAN class=203381016-10032008><FONT
face="Tempus Sans ITC" color=#800000>Seismic waves are sound waves. If you
are ever in an earthquake, you will find that sound transfers momentum.
That's why objects fall off shelves, etc.</FONT></SPAN></DIV>
<DIV><SPAN class=203381016-10032008><FONT face="Tempus Sans ITC"
color=#800000></FONT></SPAN> </DIV>
<DIV><SPAN class=203381016-10032008><FONT face="Tempus Sans ITC"
color=#800000>Cheers,</FONT></SPAN></DIV>
<DIV><SPAN class=203381016-10032008><FONT face="Tempus Sans ITC"
color=#800000></FONT></SPAN> </DIV>
<DIV><SPAN class=203381016-10032008><FONT face="Tempus Sans ITC"
color=#800000>Martha Savage</FONT></SPAN></DIV>
<DIV dir=ltr align=left><BR></DIV>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> phys-teach-talk-bounces@nzip.org.nz
[mailto:phys-teach-talk-bounces@nzip.org.nz] <B>On Behalf Of </B>Bryden,
Francis<BR><B>Sent:</B> Monday, 10 March 2008 8:38 a.m.<BR><B>To:</B>
phys-teach-talk@nzip.org.nz<BR><B>Subject:</B> RE: momentum of
sound<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">The way I think of it
is that sound transfers energy but not momentum. The individual air molecules
have momentum, but for every molecule with +p there is another with –p. I
suppose its possible for a compression to knock something over before the
rarefaction has had time to pull it back</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">On a related
note. Many of you will have seen an “airzooka” that fires a toroid of air across
the room. There is a transfer of air on this case, but why is it different to a
loudspeaker that just vibrates the air</SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"></SPAN></FONT> </P>
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style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"></SPAN></FONT> </P>
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<DIV>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Thanks <EM><I><FONT
face=Arial><SPAN style="FONT-FAMILY: Arial">................
Francis</SPAN></FONT></I></EM></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy"></SPAN></FONT> </P>
<P class=MsoNormal><EM><I><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Francis
Bryden</SPAN></FONT></I></EM></P>
<P class=MsoNormal><EM><I><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">HoD
Physics</SPAN></FONT></I></EM></P>
<P class=MsoNormal><EM><I><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">St Cuthbert's
College</SPAN></FONT></I></EM></P>
<P class=MsoNormal><EM><I><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">122 Market
Rd
or Box 26 020</SPAN></FONT></I></EM></P>
<P class=MsoNormal><EM><I><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Epsom Epsom</SPAN></FONT></I></EM></P>
<P class=MsoNormal><EM><I><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Auckland
1051
Auckland 1344</SPAN></FONT></I></EM></P>
<P class=MsoNormal><EM><I><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">New
Zealand New
Zealand</SPAN></FONT></I></EM></P>
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style="FONT-SIZE: 12pt; COLOR: navy"></SPAN></FONT> </P>
<P class=MsoNormal><EM><I><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">ph: 63 9 5204159 ext
7808</SPAN></FONT></I></EM></P>
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style="FONT-SIZE: 12pt; COLOR: navy"></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><A
href="mailto:fbryden@stcuthberts.school.nz"><EM><I><FONT face=Arial
color=navy><SPAN
style="COLOR: navy; FONT-FAMILY: Arial; TEXT-DECORATION: none">fbryden@stcuthberts.school.nz</SPAN></FONT></I></EM></A></SPAN></FONT></P></DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face=Tahoma size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">-----Original
Message-----<BR><B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B>
phys-teach-talk-bounces@nzip.org.nz [mailto:phys-teach-talk-bounces@nzip.org.nz]
<B><SPAN style="FONT-WEIGHT: bold">On Behalf Of </SPAN></B>John Bull<BR><B><SPAN
style="FONT-WEIGHT: bold">Sent:</SPAN></B> Monday, 10 March 2008 8:18
a.m.<BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> </SPAN></FONT><FONT
face=Tahoma size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">phys-teach-talk@nzip.org.nz</SPAN></FONT><FONT
face=Tahoma size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"><BR><B><SPAN
style="FONT-WEIGHT: bold">Subject:</SPAN></B> momentum of
sound</SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"></SPAN></FONT> </P>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">At the risk of sounding dumb on
Monday morning - can someone tell me whether sound has momentum, and if not -
why not? (since it is moving particles) . This was a student's question relating
to an experiment of an air rifle pellet hitting a block of
wood.</SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"></SPAN></FONT> </P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">cheers</SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt"></SPAN></FONT> </P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">John Bull</SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">St John's College
</SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Hamilton</SPAN></FONT></P></DIV></DIV></DIV>
<DIV> </DIV>
<DIV>
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