Take a cup of water, add sugar, and stir. Continue adding sugar and stirring until the sugar crystals no longer dissolve. Then apply heat to dissolve the remaining crystals. If the resulting solution is allowed to slowly cool, the solution is said to be
a. an unsaturated solution.
b. a saturated solution.
c. a supersaturated solution.
d. none of these.
c
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The night sky is dark because the Universe is not infinitely old
a. True b. False Indicate whether the statement is true or false
What mass would have to be compressed to a radius of 1.0 × 10-15 m (the order of magnitude of the radius of an atomic nucleus) in order for it to become a black hole? (G = 6.67 × 10-11 N ? m2/kg2, c = 3.0 × 108 m/s)
A) 1.1 × 10-6 kg B) 4.1 × 10-8 kg C) 2.2 × 103 kg D) 6.7 × 1011 kg E) 8.3 × 1015 kg
Observations of the tiny irregularities in the cosmic microwave background support the idea that the Universe
A. will continue to expand forever. B. will collapse in the distant future. C. is composed primarily of matter, rather than antimatter. D. contains no dark matter. E. is composed primarily of neutrinos.
The work you do is 4 J
Indicate whether the statement is true or false