# Physics

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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 -

The object is at the earth's surface.

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