A planet has double the mass of the earth. Its average density is equal to that of the earth. An object weighing W on earth will weigh on that planet:
W
W
W
Text Solution
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The formula for acceleration due to gravity is
Let the density of earth and planet be 
, and the radius of the planet be R’ Let R be the radius of the earth and g be the acceleration due to gravity of earth and g' be the acceleration due to gravity of planet. So, the masses are
...(i)
... (ii)
So, 
…(iii)
From equation (i) and (ii) we get 
Substituting the value in equation (iii),
Weight is given by W' = mg' = 
W
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