Which of the terrestrial planets has rings?
a. Mercury
b. Venus
c. Mars
d. None of the terrestrial planets has rings.
d
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Dust is an important part of the nebular theory of solar system formation because dust is needed to explain:
A) how the inner planets came to be rocky bodies. B) how the outer planets came to be gaseous bodies. C) how the initial cloud cooled enough to collapse. D) how the initial cloud heated as it contracted. E) why the icy bodies are located so far from the Sun.
An x-ray image is typically used to diagnose which of the following?
a. A muscle tear b. A broken bone c. Cardiac arrhythmia d. Low blood-oxygen levels
A 1.15-kg beaker (including its contents) is placed on a vertical spring scale. When the system is sent into vertical vibrations,
it obeys the equation y = (2.3 cm)cos(17.4 s-1 t). What is the spring constant of the spring scale, assuming it to be ideal?
A new electric power plant has an efficiency of 42%. For every 100 barrels of oil needed to run the turbine, how many are essentially lost as waste heat (in barrels of oil) to the environment?
a. 21 b. 42 c. 58 d. 10 e. 79