document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=216635>Question 216635</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A canoe is paddled at 4km/h directly across a river that flows at 3kh/h. (a) what is the resultant speed of the canoe? (b) How fast and in what direction can the canoe be paddled to reach a destination directly across the river. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #163571 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=163571\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A canoe is paddled at 4km/h directly across a river that flows at 3kh/h. (a) what is the resultant speed of the canoe? (b) How fast and in what direction can the canoe be paddled to reach a destination directly across the river.<BR>\n" );
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document.write( "It's sqrt(4^2 + 3^2)<BR>\n" );
document.write( "= 5 kph<BR>\n" );
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document.write( "(b) How fast and in what direction can the canoe be paddled to reach a destination directly across the river.<BR>\n" );
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document.write( "The canoe's heading has to be upstream.<BR>\n" );
document.write( "The angle of the heading depends on the speed of the canoe (if the speed of the stream is fixed).<BR>\n" );
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document.write( "The sine of the angle of \"crabbing\" is 3/speed of the canoe.<BR>\n" );
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document.write( "If as in the example, the canoe is paddled at 4 kph, then the angle will be<BR>\n" );
document.write( "arcsin(3/4) = ~ 48.59 degs<BR>\n" );
document.write( "If it's paddled 10 kph, then the angle will be 17.46 degs.<BR>\n" );
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