Question

An object at the surface of the earth has mass 3 kg. The mass of the object at a height of 12.8 x 106 m from the surface of the earth is.

3 kg
9.75 kg
1.46 kg
4 kg

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Answer 1

Answer:

Given,

Mass=3kg

,h=128×108=12.8×107 m

R=6.4×106 m

So, h=12.8×106=2R

g′=gm(R+hR)2=9.8(R+2RR)2=9.8(31)2=99.8

Thus the weight,

W=mg′=3×99.8=3.26N