When the equation Al + O2? Al2O3 is balanced, the coefficient of Al2O3 is

a. 1
b. 2
c. 3
d. 4


b

Physics & Space Science

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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.

Physics & Space Science

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 forces

Physics & Space Science

Plane polarized light of intensity is sent through a polarizer rotated 45clockwise 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

Physics & Space Science

A 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

Physics & Space Science