Does the slope of the graph in Procedure 1 have units? Why or why not?
No. The units of the x and y axis are the same. They cancel.
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Which of the following is true of Venus?
A) Its atmosphere is transparent to visible light. B) Its atmosphere is transparent to infrared radiation. C) Its atmosphere is as dense as that of Earth. D) Its atmosphere is mostly composed of carbon dioxide.
In what way does our theory of nuclear fusion predict that the Sun should be different today than it was when fusion began about 4-1/2 billion years ago?
A) The Sun's mass should be about 30% higher today. B) The Sun's mass should be about 30% lower today. C) The Sun's luminosity should be about 30% higher today. D) The Sun's radius should be about 30% higher today. E) The Sun's distance from Earth should be about 30% lower today.
What is the phase of the Moon shown in the above image?
a. waxing gibbous b. third quarter c. waning gibbous d. first quarter
What observational evidence supports the idea that a collision between two spiral galaxies might lead to the formation of a single elliptical galaxy?
A) Some elliptical galaxies surrounded by shells of stars that probably formed from stars stripped out of smaller galaxies. B) Elliptical galaxies dominate the galaxy populations at the cores of dense clusters of galaxies. C) Elliptical galaxies with stars and gas clouds that orbit differently from the other stars in the galaxy. D) There are giant elliptical galaxies at the center of dense clusters that may have grown by consuming other galaxies. E) All of the above are correct.