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7.Gravitation
easy
${g_e}$ and ${g_p}$ denote the acceleration due to gravity on the surface of the earth and another planet whose mass and radius are twice as that of earth. Then
A
${g_p} = {g_e}$
B
${g_p} = {g_e}/2$
C
${g_p} = 2{g_e}$
D
${g_p} = {g_e}/4$
Solution
(b) $g \propto \frac{M}{{{R^2}}}$. If mass and radius of the planet are twice then ${g_\rho }$ will be half that of ${g_e}$ i.e. ${g_p} = \frac{{{g_e}}}{2}$
Standard 11
Physics
