Question

A 8m long string of rubber, having density $1.5\times 10^{3}kg/m^3$ and young's.modulus $5\times 10^{6}N/m^2$ is suspended from the ceiling of a room. The increase in its length due to its own weight will be $(g=10m/s^2)$

• A. $9.6\times 10^{-2}m$
• B. $19.6\times 10^{-5}m$
• C. $9.6\times 10^{-3}m$
• D. 9.6 m

Answer 1

Answer: (A)

$K=\frac{F/A}{(\Delta l/l)}$