Fusion is promoted in the core of the Sun by the _______ there
a. low temperature and low density
b. high temperature and high density
c. low temperature and high density
d. high temperature and low density
b
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The hydrogen Balmer line H? has a wavelength of 434.0 nm in the laboratory. It is observed in a quasar at 651.0 nm. In terms of the speed of light, what is the recessional velocity of this quasar?
a. 217.0 b. 2 c. 1.5 d. 0.67 e. 0.5
Three particles of equal charge, X, Y, and Z, enter a uniform magnetic field 
. X has velocity of magnitude v parallel to the field. Y has velocity of magnitude v perpendicular to the field. Z has equal velocity components v parallel and perpendicular to the field. Rank the radii of their orbits from least to greatest.
A.
B.
C.
D.
E.
.What is the significance of large percentage of oxygen in Earth's atmosphere?
What will be an ideal response?
Chapter 1 contains a quotation by author Norman Mailer from his book Of a Fire on the Moon. Mailer's point is that
A) quantum theory shows that the universe is infinitely deep and subtle. B) physics professors are a bunch of crackpots. C) with the help of science and technology, we are solving most of the world's social problems. D) science is leading us toward a greater understanding of the important truths in life. E) science and technology give us power over nature but our culture we don't know how to use that power.