Where does the center of gravity of the atmosphere of the earth lie? `(AS_(2))`

Where does the centre of gravity of a sphere and triangular lamina lie?

Acceleration due to gravity at the centre of the earth is :-

Explain some situations where the center of gravity of man lies outside the body. (AS_(1))

The height at which the acceleration due to gravity becomes g/9 (where g = acceleration due to gravity on the surface of the earth) in terms of R, the radius of the earth is .........

A small body of mass m falls to the earth from infintie distance away. What will be its velocity or reaching the earth? (Radius of the earth = R, acceleration due to gravity on the surface of the earth is g) :-

The radius of the earth is 4 times that of the moon and its mass is 80 times that of the moon. If the acceleration due to gravity on the surface of the earth is 10m//s^2 that on the surface of the moon will be .........