Physics HELLLPPPP

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When we say that the weight of an object is Mg, and that g = 9.8 N/kg, what assumptions are we making?
Which of the below?

-The distribution of mass in the earth is spherically symmetric.
-The density of the earth is the same everywhere.
-The earth's interior is solid everywhere.
-The orbit of the earth is circular and not elliptical.
-We neglect the effect of astronomical bodies other than the earth.
-The object is at the earth's surface.
-Two significant figures are sufficient.
-Newton's law of gravitation holds.

  • Physics HELLLPPPP -

    -The distribution of mass in the earth is spherically symmetric.
    Yes, if all the mass were under Paris, g would be very high there.

    -The density of the earth is the same everywhere.
    No, all the mass could be at the center

    -The earth's interior is solid everywhere.
    No, again all the mass could be at center

    -The orbit of the earth is circular and not elliptical.
    Not relevant

    -We neglect the effect of astronomical bodies other than the earth.
    Yes

    -The object is at the earth's surface.
    Yes

    -Two significant figures are sufficient.
    Yes

    -Newton's law of gravitation holds.
    Yes

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