Asked by Marc

A man weighs 900N on the surface of the earth. Compare his weight in an airplane flying at an elevation of 9000m. Note that the radius of Earth is 6378km.
Answered by bobpursley
weight=900*(6378/6378+9)^2
Answered by Anonymous
90000N
Answered by Nikee
Using gravitational law, F = G(m1)(m2)/r^2, where m1 is the mass of the earth = 5.9742x10^24kg, m2= mass of the man = 900/9.81 = 91.74kg, the r is the distance between the man and the center of the air and it is equal to (6378km+9000m = 6387km), this computation is almost equal to the answer when the solution you use is ratio and proportion.