A string of area of cross-section 4 mm^2 and length 0.5 m is connected with a rigid body of mass 2 kg. The body is rotated in a vertical circular…

A string of area of cross-section $\displaystyle 4 \mathrm{~mm}^2$ and length $\displaystyle 0.5$ m is connected with a rigid body of mass $\displaystyle 2$ kg . The body is rotated in a vertical circular path of radius $\displaystyle 0.5$ m . The body acquires a speed of $\displaystyle 5 \mathrm{~m} / \mathrm{s}$ at the bottom of the circular path. Strain produced in the string when the body is at the bottom of the circle is \_\_\_\_ $\displaystyle \times 10^{-5}$. (use young's modulus $\displaystyle 10^{11} \mathrm{~N} / \mathrm{m}^2$ and $\displaystyle \mathrm{g}=10 \mathrm{~m} / \mathrm{s}^2$ )