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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