what are the two forces that compete with each other to determine the ultimate fate of a star?
What will be an ideal response?
gravity and the force of nuclear fusion reactions
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If a wave has a frequency of 12 Hz, it has a period of
a. 1/12 s. b. 3.5 s. c. 144 s. d. 12 s.
Why do we think that active galaxies have small core regions?
A. They emit radio waves that larger objects cannot do. B. We can measure their size on the sky, which means they are small and near. C. They are very far away, and thus are younger and less expanded. D. Their light varies rapidly, implying small radius.
Most millisecond pulsars are found in ________ star clusters
Fill in the blank(s) with correct word
An ideal gas is allowed to undergo a free expansion. If its initial volume is V1 and its final volume is V2, the change in entropy is
a. nR ln (V2/V1) b. nRT ln (V2/V1) c. nk ln (V2/V1) d. 0 e. nR V2/V1