IAS-1. A heavy uniform rod of length 'L' and material density '??' is hung vertically
with its top end rigidly fixed. How is the total elongation of the bar under its
own weight expressed? [IAS-2007]
(a)
2 L2g
E
??
(b)
L2g
E
??
(c)
2
2
L g
E
??
(d)
2
2
L g
E
??
IAS-1. Ans. (d) Elongation due to self weight =
?? ?? 2
2 2 2
WL ALg L L g
AE AE E

 

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