One of the discoveries made by the Voyager probes while near Jupiter was:
A) Io has a featureless surface that never changes.
B) a thin ring of dust around the equator.
C) the absence of a magnetic field around the giant planet.
D) that the Great Red Spot is uniform and featureless.
E) each of the four large moons produces a strong magnetic field.
B
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Pluto is different from the Jovian planets in all of the following ways except which one?
A) Its orbit is not very close to being circular. B) It formed outside of the frost line in the solar nebula. C) It has a solid surface. D) It is made mostly of ices. E) It doesn't have rings.
A relationship such as 1 in. = 2.54 cm is a(n)
a. equivalence statement. b. base unit. c. derived unit. d. fundamental quantity.
The theory of nuclear astrophysics is that all the heavy elements like uranium are formed in the interior of massive stars. These stars eventually explode, releasing these elements into space. If we assume that at the time of the explosion there were
equal amount of U-235 and U-238, how long ago did the star(s) explode that released the elements that formed our Earth? The present U-235/U-238 ratio is 0.0070 . [The half-lives of U-235 and U-238 are 0.7 × 10^9 yr and 4.47 × 10^9 yr.]
A source of sound remains stationary relative to the person in this figure. If the sound source remained stationary but the person moved toward the source, how would the frequency heard by the person change?
a. The frequency would be higher. b. The frequency would be lower. c. The frequency would remain the same. d. The answer depends on distance to the source.