What do we mean by the star-gas-star cycle?
A) It is the continuous recycling of gas in the galactic disk between stars and the interstellar medium.
B) It is the idea that stars in close binary systems can exchange gas with one another.
C) It is the set of nuclear reactions by which heavy elements are produced in the cores of massive stars.
D) It describes the orbits of the stars and interstellar medium around the center of the galaxy.
A) It is the continuous recycling of gas in the galactic disk between stars and the interstellar medium.
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At which lunar phase(s) are tides most pronounced (for example, the highest high tides)?
A) both new and full moons B) both first and third quarters C) full moon only D) new moon only E) third-quarter moon only
A piece of rope is pulled by two people in a tug-of-war. Each exerts a 400-N force. What is the tension in the rope?
A) zero B) 400 N C) 600 N D) 800 N E) none of the above
For water at 2°C,
A) Cp = Cv. B) Cp > Cv. C) Cp < Cv. D) More information is needed to answer this question.
The law of gravity was invented by
A) Copernicus. B) Ptolemy. C) Galileo. D) Kepler. E) Newton.