A uniform heavy rod of mass 20 kg. Cross sectional area 0.4 m 2 and length 20 m is hanging from a fixed support. Neglecting the lateral contraction, the elongation in the rod due to its own weight is 
. The value of x is_____.(Given. Young's modulus Y=2 x 10 11 Nm -2 and g=10ms -2 )
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(25)
let extension is dy in length dx
Tension at a distance x from lower end = 
So. 
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