1.

The radii of two planets are R and 2R respectively and their densities p and p"/"4 respectively. What is the ratio of acceleration due to gravity at their surfaces?

Answer»

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Solution :Here `G=(GM)/(R^2)=(G)/(R^2)*(4)/(3)piR^3p`
or `g propto Rp`
`:. ""(g_1)/(g_2)= (R_p)/(2R*(p)/(4))=2 : 1`.


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