When water at 4°C is heated, it expands. When water at 4°C is cooled, it
1) contracts,
2) expands,
3) neither contracts nor expands,
4) not enough information given,
which follows from the fact that
5) cooling decreases the kinetic energy of H2O molecules.
6) water has its greatest density at 4°C.
7) we do not know how the water is cooled.
Answer: 2, 6
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Most active galactic nuclei are found at large distances from us, with relatively few nearby. What does this imply?
A) Supermassive black holes existed only when the universe was young, and no longer exist today. B) Active galactic nuclei can form only at large distances from the Milky Way. C) Active galactic nuclei exist tend to become less active as they age. D) The jets seen in many active galactic nuclei must cause them to move far away from us.
Four electrons move from point A to point B in a uniform electric field as shown below. Rank the electrons in diagrams I through IV by the changes in potential from most positive to most negative when traveling from A to B
a.
I = II = III = IV.
b.
II = III > I > IV.
c.
III > I = IV > II.
d.
II > I = IV > III.
e.
I > II = III > IV.
A 7.00-? resistor is dissipating 70.0 watts. What are the current through it and the potential difference across it?
a. 10.0 A, 22.1 V b. 22.1 A, 3.16 V c. 3.16 A, 22.1 V d. 3.16 A, 10.0 V e. 10.0 A, 70.0 V
Which of the following atoms normally has one covalent bond to it?
a. I b. O c. C d. P e. Kr