Where did Earth’s (interior) heat come from?
a. volcanoes
b. accretion and differentiation as Earth formed
c. radioactivity
d. all of the above
e. b and c
Answer : e. b and c
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Which of the following best describes a sound level of intensity 10–6 W/m2?
a. extremely loud c. normal conversation b. about that of a power mower d. like a whisper
A main sequence star begins transforming into a red giant when
A) helium begins fusing. B) helium within the core begins to expand. C) contracting helium causes hydrogen to fuse. D) hydrogen starts fusing within the core.
According to Galileo, the acceleration of a freely falling object due to gravity is ____
a. larger if the object is dropped from a greater height b. smaller if the object is dropped from a greater height c. larger if the mass of the object is larger d. smaller if the mass of the object is larger e. the same regardless of the mass and the height from which it is dropped
At what location does an artificial Earth satellite in elliptical orbit have its lowest speed?
a. nearest the Earth c. between Earth and Moon b. farthest from the Earth d. between Earth and Sun