document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=22230>Question 22230</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The displacement of a body is given by s =4sin(t+30), and a force acting upon the body is given by F=7sin(t-60).  If the energy of the motion, E, at at time t is the product Fs, show that E=-14cos(2t-30) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #10862 by </B><A HREF=/tutors/aboutme.mpl?userid=khwang><B>khwang(438)</B></A><img src=\"/images/stars/stars-10.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=khwang><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=10862\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">   s =4sin(t+30), and a force acting upon the body is given by F=7sin(t-60).  If the energy of the motion, E, at at time t is the product Fs, show that <BR>\n" );
document.write( "E=-14cos(2t-30)\r<BR>\n" );
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document.write( "Use the formula:\r<BR>\n" );
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document.write( " 2 sin A sin B = cos (A-B) - cos(A+B) and cos 90 deg= 0\r<BR>\n" );
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document.write( " Kenny<BR>\n" );
document.write( " </SPAN>\n" );
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