Question

A man weighs 60N at earth surface .Ay what height above the earth surface weight becomes 30N ? Take radius of earth as 6400 km

Answer 1

Answer:

Explanation:

g(R)=GM/R2

BUT FOR H HEIGHT

g(H)=GM/(R+H)2

take the ratio of both equations and get the answer it would be around 2600

Answer 2

Answer:

F=mg

m=F/g

    =60/10=6kg (Weight of the body at the surface)

F=mg

m=30/10=3kg(Weight of the body at a height h)

Loss of weight of the body=2mgh/R

                                        3=2 x 6 x 10 x h/6400000

                                        3=12h/640000

                                          1920000=12h

                              Therefore the height h=1920000/12=160000

                                                                    =160 km

Explanation:

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