document.write( "Question 1092738: the vector sum of a force of 12N and a force of 9N is 3N. the angle between them is \n" ); document.write( "

Algebra.Com's Answer #707329 by Fombitz(32388) $\"\"$ $\"About$

You can put this solution on YOUR website!
Use the first vector as the x direction of the coordinate system,
\n" ); document.write( "( $\"12\"$ , $\"0\"$ )+( $\"9cos%28theta%29\"$ , $\"9sin%28theta%29\"$ )=( $\"3\"$ , $\"0\"$ )
\n" ); document.write( "So,
\n" ); document.write( " $\"12%2B9cos%28theta%29=3\"$
\n" ); document.write( " $\"0%2B9sin%28theta%29=0\"$
\n" ); document.write( "So then,
\n" ); document.write( " $\"cos%28theta%29=-1\"$
\n" ); document.write( " $\"sin%28theta%29=0\"$
\n" ); document.write( "So,
\n" ); document.write( " $\"theta=pi\"$
\n" ); document.write( " \n" ); document.write( "

\n" );