If the current flowing through a circuit of constant resistance is doubled, the power dissipated by that circuit will
A) quadruple in magnitude.
B) double in magnitude.
C) decrease to one-half of what it was.
D) decrease to one-fourth of what it was.
A
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Most active galactic nuclei are found at large distances from us, with relatively few nearby. What does this imply?
A) Active galactic nuclei exist tend to become less active as they age. B) Supermassive black holes existed only when the universe was young, and no longer exist today. C) Active galactic nuclei can form only at large distances from the Milky Way. D) The jets seen in many active galactic nuclei must cause them to move far away from us.
If all people, animals, trains and trucks all over the world began to walk or run towards the east (opposite the direction of Earth's spin), then
A) Earth would spin a bit faster. B) Earth would spin a bit slower. C) Earth's spin would not be affected at all.
A Doppler effect occurs when a source of sound moves
A) towards you. B) away from you. C) either of these D) neither of these
_____________ is a very long and deep canyon on Mars
a. Valles Marineris b. Ishtar Terra c. Tharsis Bulge d. Lobate Scarp e. Phobos