Posted by **NATTT** on Friday, January 25, 2013 at 4:16pm.

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 -
**Damon**, Friday, January 25, 2013 at 4:57pm
-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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