Physics

Problem

6\,\text{kg}

object is lowered to a depth

d

where its weight becomes

90\%

of its surface weight. It is then raised to a height

h

where its weight is

1\,\text{N}

less than the weight at depth

d

. Taking

g = 9.8\,\text{m\,s}^{-2}

and

R = 6400\,\text{km}

, the height

h

is approximately a)

640\,\text{km}

373\,\text{km}

750\,\text{km}

410\,\text{km}