A) \[39.2\times {{10}^{4}}J\]
B) \[1.4\times {{10}^{6}}J\]
C) \[1.37\times {{10}^{7}}J\]
D) \[8.5\times {{10}^{-3}}J\]
Correct Answer: C
Solution :
\[\text{1000}\,\,\text{litres=1}\,\,{{\text{m}}^{\text{3}}}\] Volume of water\[\text{=40,000}\,\,\text{litres}\] \[\text{=}\frac{\text{40,000}}{\text{1000}}\text{=40}\,\,{{\text{m}}^{\text{3}}}\] Mass of water, \[m=\] density \[\times \] volume \[=1000\times 40=40,000\,\,kg\] \[P.E.=mgh=40,000\times 9.8\times 35\] \[=1.37\times {{10}^{7}}J\]
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