When the equation Al + O2? Al2O3 is balanced, the coefficient of Al2O3 is
a. 1
b. 2
c. 3
d. 4
b
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Plane polarized light of intensity 
is sent through a polarizer rotated 45
clockwise to the original plane of polarization and then through a second polarizer rotated 45 
counter-clockwise measured from the original plane of polarization. What is the transmitted intensity?
A. 0.71 
B. 0.50
C. 0.35
D. 0.25
E. 0
Steam burns are much more damaging than boiling-water burns because steam
A) has a higher temperature. B) releases more thermal energy. C) is hotter. D) is gaseous.
Classify the following statement as a characteristic
(a) of electric forces only, (b) of magnetic forces only, (c) of both electric and magnetic forces, or (d) of neither electric nor magnetic forces. The force is proportional to the magnitude of the field exerting it.
1.electric forces 2.magnetic forces 3.both electric and magnetic forces 4.neither electric nor magnetic forcesA scuba diver has his lungs filled to half capacity (3 liters) when 10 m below the surface. If the diver holds his breath while quietly rising to the surface, what will the volume of the lungs be (in liters) at the surface? Assume the temperature is the same at all depths. (The density of water is 1.0 × 10^3 kg/m3.)
a. 5.9 b. 4.5 c. 6.4 d. 3.9 e. 3.1