For gasoline to explode, it needs
A. to be mixed with oxygen
B. to be mixed with nitrogen
C. to be mixed with carbon dioxide
D. No mixing needed; just a spark.
Answer: A. to be mixed with oxygen
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The Bohr theory was developed to explain which of these phenomena?
a. The photoelectric effect b. Line spectra c. Quantum numbers d. X-rays
How does the differentiation process generate heat?
A. As low-density rock rises to the surface, it carries heat from the interior of the planet. B. As dense material sinks through less dense rock, it generates heat through friction. C. Iron and nickel accumulating at the center of the planet concentrate the planet's heat. D. Heat is generated by the constant bombardment of the planet by planetesimals.
A nail with a diameter of 1.00 mm projects 25.0 mm horizontally outward from a wall. A 40.0 N picture is hung from the end of the nail. If the shear modulus is 
then how much does the nail deflect downward?
A. 
B. 
C. 
D. 
E. 
The pressure in the photosphere affects the width of spectral lines
Indicate whether the statement is true or false