______________are mixtures of metal elements with other elements.
Fill in the blank(s) with the appropriate word(s).
Alloys
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Which is the strongest fundamental force?
A) gravitational force. B) electric force. C) nuclear strong force. D) none of the above
The major source of NOx pollution is
a. combustion for electrical generation. b. industry. c. transportation. d. domestic heating.
The energy of an electron state has an uncertainty of about 0.500 eV. What is the uncertainty in the life-time of the level?
A) 1.32 × 10-15 s B) 8.28 × 10-15 s C) 1.32 × 10-11 s D) 8.28 × 10-11 s E) 1.32 × 10-8 s
Space-time will be flat if
a. the Universe is expanding. b. the Universe is accelerating. c. the average density of the Universe is equal to the critical density. d. the Universe is finite. e. the Universe is homogeneous and isotropic.