What can we conclude about the structure of Earth's interior knowing that the average density of Earth is higher than the average density of the rock on the continents and seafloor?

A) That Earth's most dense material must be water
B) That Earth's most dense material must be the seafloor and the continents
C) That Earth's most dense material must be beneath the surface
D) That Earth's least dense material must be the seafloor and the continents
E) That Earth's least dense material must be beneath the surface


C

Physics & Space Science

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Coulomb's Law: As shown in the figure, three charges are at the vertices of an equilateral triangle. The charge Q is 6.7 nC, and all the other quantities are accurate to two significant figures. What is the magnitude of the net electric force on the charge Q due to the other two charges? (k = 1/4??0 = 9.0 × 109 N ? m2/C2) 

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