A) 5.75 R from centre of moon
B) 16 R from surface of moon
C) 53 R from centre of earth
D) 54 R from centre of earth
Correct Answer: D
Solution :
[d]\[{{\operatorname{E}}_{earth}}={{E}_{moon}}\] \[\Rightarrow \frac{GM}{{{x}^{2}}}=\frac{GM/81}{{{\left( 60R-x \right)}^{2}}}\] \[\Rightarrow \frac{1}{x}=\frac{1}{9\left( 60R-x \right)}\] \[\Rightarrow x = 54 R\]from centre of earth.You need to login to perform this action.
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