What fraction of the solar system's mass is in the Sun?
a) About 50%
b) About 99%
c) About 10%
d) Less than 1%
e) About 75%
Answer: b) About 99%
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You are standing in a moving bus, and you suddenly fall backward. You can imply from this that the bus's
A) velocity increased. B) speed remained the same, but it's turning to the left. C) velocity decreased. D) speed remained the same, but it's turning to the right. E) the bus stopped.
If CP for an ideal gas is 35.4 J/mol/K, which of the following is CV for this gas?
a. 12.5 J/mol/K b. 20.8 J/mol/K c. 29.1 J/mol/K d. 27.1 J/mol/K e. 43.4 J/mol/K
In the context of nuclear fusion in massive stars, which of the following statements is true of carbon fusion?
A) At lower temperatures than carbon fusion, nuclei of oxygen, neon, and magnesium fuse to make iron. B) At lower temperatures than carbon fusion, iron can fuse to make silicon. C) As carbon is exhausted, core ignition and shell ignition continue with a series of heavier nuclei as fusion fuel. D) As soon as the carbon is exhausted in the core of massive stars, the core expands, and carbon ignition pauses.
Energy in Nuclear Reactions: An electron and a positron, both essentially at rest, annihilate each other, emitting two identical photons in the process. What is the wavelength of these photons? The mass of an electron or positron is 9.11 × 10-31 kg. (h = 6.626 × 10-34 J ? s, c = 3.00 × 108 m/s)
A. 1.21 × 10-12 pm B. 1.73 pm C. 2.42 pm D. 3.07 pm E. 3.46 pm