Question

If the mass of moon is $\frac{1}{90}$ of earths mass, its radius is $\frac{1}{3}$ of earths radius and if $g$ is acceleration due to gravity on earth, then the acceleration due to gravity on moon is ...... :

• A. $\frac{g}{3}$
• B. $\frac{g}{90}$
• C. $\frac{g}{10}$
• D. $\frac{g}{9}$
• E. $\frac{g}{8}$

Answer 1

Answer: (C)

$g_m=\frac{G\times M/90}{{(R/3)}^3}=\frac{1}{10}g$