Question

For moon, its mass is 1/81 of earth mass and its diameter is 1/3.7 of earth dia.If acceleration due to gravity at earth surface is 9.8m/s2 then at moon its value is :

Answer 1

You can use the equation to find g, that is:

[math]g = G * M / d^2[/math]

Use [math]g_{EARTH} = 9,82 m/s^2[/math], [math]M_{MOON} = M_{EARTH} / 80[/math], and [math]d_{MOON} = d_{EARTH}/4[/math] and calculate [math]g_{MOON}[/math].

[math]g_{MOON} = G * M_{MOON} / d_{MOON} ^2[/math]

G is the gravitational constant, and you won’t need it in this calculations.