81. A rubber pipe of density
A rubber pipe of density 1..5×103 N/m2 and Young’s modulus is 5×106 N/m2 suspended from the roof. The length of the pipe is 8 m. What will be the change in length due to its own weight
(a) 9.6 m (b) 9.6×103 m
(c) 19.2×10-2 m (d) 9.6×102 m
Answer-d
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a