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Old Jun 25th 2009, 09:37 AM   #1
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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.
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Old Jun 25th 2009, 09:02 PM   #2
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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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