What will happen in the Sun immediately after it has exhausted its supply of hydrogen in its core?
A) The core will collapse and a supernova will result.
B) The Sun will turn into a white dwarf and cool off forever.
C) The helium core will shrink, heat, and start fusing helium to carbon.
D) The helium core will shrink and heat; a shell of hydrogen will start fusing.
B
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The photo shows a galaxy known as Arp 220, and the inset shows this galaxy's spectrum. What can you infer?
A) Most of the light from this galaxy is infrared, indicating active star formation. B) Most of the light from this galaxy is visible light, and it comes from an active galactic nucleus. C) The broad peak is a spectral line indicating the presence of massive amounts of hydrogen gas. D) The spectrum peaks in the infrared, indicating that this galaxy has a huge redshift and must be far away.
You and your friend both solve a problem involving a skier going down a slope, starting from rest. The two of you have chosen different levels for y = 0 in this problem. Which of the following quantities will you and your friend agree on?
A) skier's PE B) skier's change in PE C) skier's final KE a) only B b) only C c) A, B, and C d) only A and C e) only B and C
An intermediate _____________can have a wider region of possible compositions than does an intermediate compound.
Fill in the blank(s) with the appropriate word(s).
The information on a one-gallon paint can is that the coverage, when properly applied, is 270 ft2 . One gallon is 231 in3 . What is the average thickness of the paint in such an application?
a. 0.0036 in. c. 0.043 in. b. 0.0059 in. d. 0.053 in.