Factors that increase ocean salinity are
A) runoff from streams and rivers.
B) formation of sea ice.
C) precipitation.
D) glacial melting.
Answer: B
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Which low-mass star does not have fusion occurring in its central core?
A) a main-sequence star B) a red giant C) a helium-burning star
A girl throws a rock horizontally with a speed of 12 m/s from a bridge. It falls 2.28 s before hitting the water below. Neglect air
(a) How high is the bridge from the water below? (b) How far horizontally does the rock travel before striking the water?
An electron of mass 9.11 × 10^?31 kg moves with a speed of 0.630c. What is its total energy? (c = 3.00 × 10^8 m/s)
a. 6.37E–14 J b. 2.36E–14 J c. 1.63E–14 J d. 1.06E–13 J e. 1.01E–13 J
Two nuclei which share the same atomic number Z always are
a. stable. b. unstable. c. isotopes. d. isobars. e. radioactive.