; XII. 



we considered the 

 ngs; we now procc 



,**itions rein' \ihle *xto*ibU strings. E 



<* are also called elastic strings. 



M A uniform extensible string is stretched by a force, 



::n nt that the extenflioii vanes as the 



original length. / th- stretched 



' 



re X is some constant depending on the nature of the 

 ttg. 



pressed by this equation is called Hookers law, 

 aame of its disco v 



: quantity X is sometimes called the modulus ofelcut 



equation /-/'- if we put 7*-X we obtain 



n 



Z-2/'; thu-* tin- innilulu-* of elasticity for any n lastic 



string is equal t> -ion require 



to ii :h. 



W a weight attached to one <W, iV 

 ' hangs vertically ; determine the ex- 

 of the tiring, taking it* own weight into account. 



