C3H4 is an example of a(n)
a. aromatic.
b. alkene.
c. alkyne.
d. alkane.
e. cycloalkane
c
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The observational evidence in favor of the existence of dark energy involves using ________ to calculate ________.
A. the method of standard candles; the distance to distant galaxies B. the method of inflation; the distance to distant galaxies C. Hubble's law; the distance to distant galaxies D. Hubble's law; the age of the Universe
Which of these would typically be among the brightest stars in an ancient globular cluster?
A) A4 B) K3 C) O3 D) B3 E) M5
Suppose the ends of a 30-m-long steel beam are rigidly clamped at 0°C to prevent expansion. The beam has a cross-sectional area of 30 cm2 . What force against the clamps does the beam exert when it is heated to 40°C? (?Steel = 1.1 × 10^?5/°C, Ysteel = 20 × 10^10 N/m2)
Linus claims that the added gravitational force of neutrons holds the particles in a nucleus together. Linnea says that they stick together because they lose their electric charge when they form a nucleus. Which one, if either, is correct, and why?
a. Linus, because more particles exert gravitational forces on one another than exert electromagnetic forces. b. Linus, because the numerical magnitude of G/ke is 7.42 × 10^-21. c. Linnea, because the numerical magnitude of G/ke is 7.42 × 10^-21. d. Both, because electric charge is lost and then gravity holds the nucleus together. e. Neither, because gravity is not lost, and the numerical magnitude of ke/G is 1.35 × 10^20.