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Homework Help: Physics HELLLPPPP

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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