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Unformatted text preview: n . 1 B. lattice with a basis: L16C C. Two more examples 1. FW #4.11: stretched spring. Rest length = a , average length along x is = with 2 directions for displacement: R = q ( x j-x j-1 ) 2 + ( y j-y j-1 ) 2 = q ( + j- j-1 ) 2 + ( y j-y j-1 ) 2 R-a ( -a ) + j- j-1 + (1 / 2 )( y j-y j-1 ) 2 ( K/ 2)( R-a ) 2 ( K/ 2)[( -a ) 2 + 2( -a )( j- j-1 ) + ( j- j-1 ) 2 + (1-[ a/ ])( y j-y j-1 ) 2 ] The sign of the force constant for the y-motion depends on the sign of -a . 2. FW #4.13. 2...
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- Fall '09