What do we mean by the observable universe?
A) the part of the universe that we can see with the naked eye
B) the part of the universe that we can see through telescopes
C) the part of the universe that could be observed in principle, including things that may require future technologies
D) the compendium of all objects that we have observed to date
E) the entire universe, since it is inconceivable that there could be parts of the universe that we cannot observe
C
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Briefly explain how the Sun became hot enough for nuclear fusion
What will be an ideal response?
Is the burning of a match an exothermic reaction?
Find the tension in an elevator cable if the 1000-kg elevator is ascending with an acceleration of 1.2 m/s2, upward
a. 11,000 N c. 8600 N b. 9800 N d. 1200 N
Large deposits of gypsum and other evaporite minerals are evidence of
A) volcanic activity during the Cambrian period. B) dried up shallow seas from the Silurian period. C) seafloor spreading during the Permian period. D) glaciation during the Triassic period.