Which of the following elements commonly forms an ion with a 2+ charge?

a. Li
b. Al
c. S
d. Ca


d

Physics & Space Science

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Vision Problems: If the lens in a person's eye is too highly curved, this person is suffering from

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Physics & Space Science

Which of the following describes volcanism?

A) the excavation of bowl-shaped depressions by asteroids or comets striking a planet's surface B) the eruption of molten rock from a planet's interior to its surface C) the disruption of a planet's surface by internal stresses D) the wearing down or building up of geological features by wind, water, ice, and other phenomena of planetary weather

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If CP for an ideal gas is 35.4 J/mol/K, which of the following is CV for this gas?

a. 12.5 J/mol/K b. 20.8 J/mol/K c. 29.1 J/mol/K d. 27.1 J/mol/K e. 43.4 J/mol/K

Physics & Space Science

Resistance and Resistivity: Consider two copper wires of equal cross-sectional area. One wire has 3 times the length of the other. How do the resistances of these two wires compare?

A. Both wires have the same resistance. B. The longer wire has 1/3 the resistance of the shorter wire. C. The longer wire has 3 times the resistance of the shorter wire. D. The longer wire has 9 times times the resistance of the shorter wire. E. The longer wire has 27 times times the resistance of the shorter wire.

Physics & Space Science