If 25 kg of ice at 0°C is combined with 4 kg of steam at 100°C, what will be the final equilibrium temperature (in °C) of the system?
A. 40
B. 20
C. 60
D. 100
E. 8
Answer: B
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Intensity of Sound: Suppose that a sound source is emitting waves uniformly in all directions. If you move to a point twice as far away from the source, the frequency of the sound will be
A. unchanged. B. half as great. C. one-fourth as great. D. twice as great.
Which of the following statements about stages of nuclear burning (i.e., first-stage hydrogen burning, second-stage helium burning, etc.) in a massive star is not true?
A) Each successive stage of fusion requires higher temperatures than the previous stages. B) As each stage ends, the core shrinks further. C) Each successive stage creates an element with a higher atomic weight. D) Each successive stage lasts for approximately the same amount of time.
Based on current observations, ____ has a heavy element core, and a very compressed liquid layer and atmosphere both made mostly of hydrogen
a. Jupiter b. Pluto c. Venus d. an asteroid e. a meteor
When we look at the Andromeda Galaxy tonight though our telescope, we see this galaxy
a) as it was just after the big bang b) as it was 3.2 years ago as it was when the light left this galaxy c) as it is now because light travel instantaneously d) as it was 2.5 million years ago when the light that we are seeing today left that galaxy