Gravitation and Kepler's Laws

An aircraft is flying at an altitude of 10.0 km above sea level. The average radius of Earth is 6370 km. Calculate the ratio:

Determine the height above sea level at which the gravitational field strength is reduced to 99% of its value at sea level.

Two asteroids X and Y can be modelled as uniform spheres of the same density. The radius of asteroid X is twice that of asteroid Y. What is the ratio:

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