A cylindrical bar has a length $L=5 \mathrm{~m}$ and cross section area $S=10 \mathrm{~m}^{2}$. The bar is made of a linear elastic material with a density $\rho=2700 \mathrm{~kg} / \mathrm{m}^{3}$ and Young's modulus $\mathrm{E}=70 \mathrm{GPa}$. The bar is suspended as shown in the figure and is in a state of uniaxial tension due to its self-weight.
The elastic strain energy stored in the bar equals J. (Rounded off to two decimal places)
Take the acceleration due to gravity as $g=9.8 \mathrm{~m} / \mathrm{s}^{2}$.
