A) \[400\,\,N\]
B) \[300\,\,N\]
C) \[700\,\,N\]
D) \[500\,\,N\]
Correct Answer: A
Solution :
\[{{W}_{earth}}=700\,\,N=m{{g}_{earth}}\] \[{{g}_{planet}}=\frac{G{{M}_{planet}}}{R_{planet}^{2}}=\frac{G\left( \frac{1}{7}{{M}_{earth}} \right)}{\left( \frac{1}{2}{{R}_{earth}} \right)}=\frac{4}{7}{{g}_{earth}}\] \[=\frac{4}{7}\times 700\,\,N=400\,\,N\]
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