3. A body weighs 45 N on the surface of the earth. How much it will weigh on the surface of planet whose mass is 1/9th mass of earth and radius is half that of earth.
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Answer:
20N
Explanation:
as we know g= G M/R^2
so to find weight on new planet we have to find g of the new planet which we can find by using the above formula
g'=G (M/9)/(R/2)^2
= 4/9 (GM/R^2)
=4/9 g
W eight on new planet= mass of body x g'
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