The most common rock forming minerals are composed of predominantly eight elements. These minerals are the
A) silicates, carbonates, oxides, sulfides, and sulfates.
B) silicates, sulfides, and oxides.
C) silicons, borates, oxides, sulfides, and carbonates.
D) sulfates, oxides, and carbonates.
Answer: A
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Compared to the central regions of spiral galaxies, we expect elliptical galaxies to have
A) higher mass-to-light ratios because stars in elliptical galaxies are dimmer than those in spirals. B) lower mass-to-light ratios because stars in elliptical galaxies are dimmer than those in spirals. C) higher mass-to-light ratios because stars in elliptical galaxies do not have high orbital velocities. D) lower mass-to-light ratios because elliptical galaxies have less gas and dust than spirals. E) the same mass-to-light ratio because they are made of the same material, stars and dark matter.
The oscillation of the 2.0-kg mass on a spring is described by 
where x is in centimeters and t is in seconds. What is the force constant of the spring?
A.
B.
C.
D.
E.
N/mA white dwarf is
A) what most stars become when they die. B) a precursor to a black hole. C) an early stage of a neutron star. D) a brown dwarf that has exhausted its fuel for nuclear fusion.
An electron is in an infinite square well that is 2.6 nm wide. What is the smallest value of the state quantum number n for which the energy level exceeds 100 eV? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg, 1 eV = 1.60 × 10-19)
A) 43 B) 44 C) 45 D) 42 E) 41