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 Jun 25th 2009, 08:37 AM #1 Junior Member   Join Date: May 2009 Posts: 16 Gravity A heavenly body has mass one third less than that of the earth and its radius is half as that of the earth. If a stone weighs 630N on the earth surface,find its weight on the heavenly body.
 Jun 25th 2009, 08:02 PM #2 Senior Member   Join Date: Apr 2008 Location: HK Posts: 886 Gravitational pull on an object on earth surface is $\displaystyle \frac{GmM_E}{R_E^2}$ which equals 630N------(1) $\displaystyle m$ is the mass of object $\displaystyle M_E$is the mass of the Earth $\displaystyle R_E$ is the radius of earth $\displaystyle G$ is the gravitational constant Regarding the body you mentioned, Gravitational pull on an object on the body is $\displaystyle \frac{Gm(M_E/3)}{(R_E/2)^2}$ Use (1) to help you find the answer

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# A heavenly body has mass one third of the earth and its radius is half of the earth.If a stone weighs 200N on the earth surface,find its weight on that heavenly body

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