The law of universal gravitation and the force of gravity at earth's surface and at some height are equal:
(1) Gr2Mm=mg, (2) G(r+h)2Mm=mgh. Divide the second by the first:
ggh=(r+h)2r2. The systematic error between the two values is
ϵ=(1−ggh)⋅100%= =(1−(r+h)2r2)⋅100%=(r+h)2h2+2rh⋅100%. Since the systematic error must be 1%, the last equation gives us the following value of height:
1%=(6400+h)2h2+2⋅6400h⋅100%, h=32 km.
Comments
Leave a comment