document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1068565>Question 1068565</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Joe drops a rock down a very deep (400 meter) mine shaft in Jarbidge. How long will it take to hear the sound of the rock hitting after he lets go of it? The speed of sound is 343 meters / second and sound of course is not affected by gravity.  You must take the speed of sound into consideration. Answer in seconds.  Use the fact that g = 9.8 m/sec^2. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #683851 by </B><A HREF=/tutors/aboutme.mpl?userid=josmiceli><B>josmiceli(19441)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josmiceli><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=josmiceli><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=683851\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> I will say that <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+h%280%29+=+400+ ALIGN=MIDDLE  ALT=\"+h%280%29+=+400+\"   DISABLED_style= \"max-width:90%; height:auto;\" > m<BR>\n" );
document.write( "where <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+h%28t%29+ ALIGN=MIDDLE  ALT=\"+h%28t%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" > is the height in meters<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+h%28t%29+=+-%281%2F2%29%2Ag%2At%5E2+%2B+h%280%29+ ALIGN=MIDDLE  ALT=\"+h%28t%29+=+-%281%2F2%29%2Ag%2At%5E2+%2B+h%280%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+h%28t%29+=+-%281%2F2%29%2A9.8%2At%5E2+%2B+400+ ALIGN=MIDDLE  ALT=\"+h%28t%29+=+-%281%2F2%29%2A9.8%2At%5E2+%2B+400+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "-----------------------------------<BR>\n" );
document.write( "I want to find <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+ ALIGN=MIDDLE  ALT=\"+t+\"   DISABLED_style= \"max-width:90%; height:auto;\" > when <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+h%28t%29+=+0+ ALIGN=MIDDLE  ALT=\"+h%28t%29+=+0+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "( the bottom of the well )<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+0+=+-4.9t%5E2+%2B+400+ ALIGN=MIDDLE  ALT=\"+0+=+-4.9t%5E2+%2B+400+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+4.9t%5E2+=+400+ ALIGN=MIDDLE  ALT=\"+4.9t%5E2+=+400+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t%5E2+=+81.6327+ ALIGN=MIDDLE  ALT=\"+t%5E2+=+81.6327+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+t+=+9.035+ ALIGN=MIDDLE  ALT=\"+t+=+9.035+\"   DISABLED_style= \"max-width:90%; height:auto;\" > sec<BR>\n" );
document.write( "--------------------<BR>\n" );
document.write( "After <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+9.035+ ALIGN=MIDDLE  ALT=\"+9.035+\"   DISABLED_style= \"max-width:90%; height:auto;\" > sec, the sound has to travel <BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+400+ ALIGN=MIDDLE  ALT=\"+400+\"   DISABLED_style= \"max-width:90%; height:auto;\" > m to Joe's ears<BR>\n" );
document.write( "[ time in sec ] = [ distance in meters ] / [ speed in m/sec ]<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+400%2F343+=+1.166+ ALIGN=MIDDLE  ALT=\"+400%2F343+=+1.166+\"   DISABLED_style= \"max-width:90%; height:auto;\" > sec<BR>\n" );
document.write( "---------------------------<BR>\n" );
document.write( "Add the 2 computed times:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+9.035+%2B+1.166+=+10.2+ ALIGN=MIDDLE  ALT=\"+9.035+%2B+1.166+=+10.2+\"   DISABLED_style= \"max-width:90%; height:auto;\" > sec<BR>\n" );
document.write( "Joe hears the sound of the rock<BR>\n" );
document.write( "hitting the water in 10.2 sec<BR>\n" );
document.write( "-----------------------------<BR>\n" );
document.write( "check my math\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );