document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=47500>Question 47500</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I need your help with this problem:\r<BR>\n" );
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document.write( "Sound travels at 1100 ft./sec. in still air.  Linda finds an old well on a farm she has just bought and wants to know how deep it is.  She drops a rock from ground level and hears it splash 4.0  seconds later.  Correct to the nearest whole foot, how deep is the well? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #31410 by </B><A HREF=/tutors/aboutme.mpl?userid=venugopalramana><B>venugopalramana(3286)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=venugopalramana><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.geocities.com/venugopalramana/FREE_MATHS_ASSISTANCE.html valign=middle><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=31410\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> I need your help with this problem:<BR>\n" );
document.write( "Sound travels at 1100 ft./sec. in still air. Linda finds an old well on a farm she has just bought and wants to know how deep it is. She drops a rock from ground level and hears it splash 4.0 seconds later. Correct to the nearest whole foot, how deep is the well?<BR>\n" );
document.write( "LET THE WELL BE S FT.DEEP<BR>\n" );
document.write( "FIRST ROCK HAS TO FALL S FT. TO HIT THE WATER<BR>\n" );
document.write( "THE FORMULA FOR FREE FALL DUE TO GRAVITY IS<BR>\n" );
document.write( "S=UT+0.5GT^2.....HERE U=0..DROPPED FROM REST...AND G=32 FT/SEC^2<BR>\n" );
document.write( "S=0.5*32T^2=16T^2<BR>\n" );
document.write( "T=SQRT(S/16)=SQRT(S)*(1/4)<BR>\n" );
document.write( "AFTER THE SPLASH SOUND WILL TAKE S/1100 SECS TO REACH THE EAR.<BR>\n" );
document.write( "SO TOTAL TIME <BR>\n" );
document.write( "=SQRT(S)/4+S/1100=4<BR>\n" );
document.write( "LET SQRT(S)=X<BR>\n" );
document.write( "X/4+X^2/1100=4<BR>\n" );
document.write( "X^2+275X-4400=0<BR>\n" );
document.write( "X={-275+(275^2+4*4400)^0.5}/2 = 15.16 FT.<BR>\n" );
document.write( "S=X^2=229.94 FT=230 FT. </SPAN>\n" );
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