The radius of the planet Venus is nearly thesame as that of the earth but it's mass is only 80% that of the earth. If an object weighs 0.8 on the earth what does it weigh on Venus?

Calculate the value of g on venus

1 answer

g = GM/r^2 = 9.8
On Venus, g = G(.8M)/r^2 = 0.8 GM/r^2
So, what is 0.8 * 9.8?