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
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A 0.30 % C carbon steel is heated
Determine the Fourier coefficient, An , for the problem resulting in a temperature
An atom can be excited
a. if it emits a photon. b. if it collides with another atom or electron. c. if it absorbs a photon. d. if it emits a photon or if it collides with another atom or electron. e. if it collides with another atom or electron or if it absorbs a photon.
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) 
A. 2.1 × 10-3 N B. 1.2 × 10-3 N C. 1.0 × 10-3 N D. 1.4 × 10-3 N