document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=421812>Question 421812</A>: <I><SPAN STYLE=\"word-break: break-all;\"> the pendulum of a clock swings through a angle of 2.5 radians as its tip travels through an arc of 50cm. find the length of the pendulum in cm </SPAN>\n" );
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document.write( "  Denote the length of the arc L=50 cm and the angle <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+theta=2.5 ALIGN=MIDDLE  ALT=\"+theta=2.5\"   DISABLED_style= \"max-width:90%; height:auto;\" >.\r<BR>\n" );
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document.write( "  As we know <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=L=r%2A%28theta%29 ALIGN=MIDDLE  ALT=\"L=r%2A%28theta%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >, where r is the length of the pendulum.\r<BR>\n" );
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document.write( "   <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r=L%2F%28theta%29 ALIGN=MIDDLE  ALT=\"r=L%2F%28theta%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "   <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r=50%2F2.5 ALIGN=MIDDLE  ALT=\"r=50%2F2.5\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "  <BR>\n" );
document.write( "    {r=20}\r<BR>\n" );
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document.write( "  Answer: the length of pendulum is 20 cm. </SPAN>\n" );
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