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Ritika Kapoor Grade: 12
        

 in a ques.. it was given dat a wire is stretched 2 double its length.v had 2 find out stress in terms of Y , new radius etc..


my first question is wether d eqn dl/l =F/AY is valid here bcoz:area is changing significantly & dl is also large.?


secondly, do v calculate d new radius by using volume=constt => A1L1 =A2L2 or dis assumption dat volume is constt. evrytym in dis type of quesn. is wrong?


pls rply.

6 years ago

Answers : (1)

Prudhvi teja
83 Points
										

Dear Ritika


Yea your question is correct


In the question thy asked stress


and stress =  strain* Y(youngs modulus)  [HOOK'S LAW]


dl/l =F/AY  


this one is just derived from hooke's law useing stress os F/A


from hook's you can stress


'for radius use volume constant



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Prudhvi Teja


 


 



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6 years ago
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