Question

The acceleration of gravity is a function of elevation above sea level by

𝑔 = 980.6 − 3.086 × 10−6𝐻

where g is in cm/s2, and H is in cm. If an aeroplane weights 90 kN at sea

level, what is the gravity force upon it at 10,000 m elevation? What is the

percentage difference from the sea-level weight?