A) 16 joules
B) 160 joules
C) 32 joules
D) 320 joules
Correct Answer: B
Solution :
On the planet,\[g'=\frac{G\times 4M}{{{R}^{2}}}\] On the earth, \[g=\frac{GM}{{{R}^{2}}}\] \[\therefore \] \[\frac{g'}{g}=4\] \[\Rightarrow \] \[g'=4g=\mathbf{40}\,\,\mathbf{m/}{{\mathbf{s}}^{\mathbf{2}}}\] Energy needed to lift \[2\,\,kg\] mass through\[2\,\,m\] distance, \[E=mg'h\] \[=2\times 40\times 2\] \[=160\] joules.You need to login to perform this action.
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