We are looking at gravitational field intensity in particular here, and using the earth as an example. The question states: Calculate the gravitational field intensity at a height of 300.0 km from Earth's surface.
Why is it that: Since the point in question is outside of the sphere of Earth, the gravitational field there is the same as it would be if Earth's mass was concentrated at a point in Earth's centre. Therefore the equation for the gravitational field intensity near a point mass applies?
I don't understand how you could have the same gravitational field concentrated at a point, and it being the same even if you are 300km FAR FROM EARTH? Is this implying that the intensity is the same, because that doesn't make sense to me.