Question

When do the centers of gravity and mass coincide? When they don’t? Explain why is the center of gravity of the Flame Towers (building in Baku, lookup in google) is a bit below their center of mass?

Answer 1

1. Center of gravity is the mean position at which weight of the body is supposed to be act.

2. Center of mass  is the mean position at which mass of the body is supposed to be concentrated.

When the gravitational field is uniform throughout the body, then centre of gravity and center of mass coincide.

If the gravitational field is uniform g can be taken out of the summation symbol.

When the gravitational field is not uniform throughout the body, then centre of gravity and center of mass do not coincide.

When the gravitational field is not uniform throughout the body.

We can not take g out from summation symbol, Thus center of gravity is different from center of mass.

Why the center of gravity of the Flame Towers (building in Baku, lookup in google) is a bit below their center of mass?

It is because the gravitational field is weaker with increasing the height of tower .