As we become older, the frequency range of human hearing
A) decreases.
B) increases.
C) remains relatively constant.
Answer: A
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What evidence do we have that the halo population of stars are older than other stars in the galaxy?
A) They are farther away. B) They have higher masses than other stars in the galaxy. C) They have fewer planets. D) They have a smaller proportion of heavy elements. E) They move slower than other stars in the galaxy.
You throw a baseball horizontally, and Jill catches it. Neglect air resistance. The energy transformation that occurs during the catch is
A) kinetic E ? thermal E. B) thermal E ? kinetic E. C) kinetic E ? chemical E. D) chemical E ? kinetic E. E) chemical E ? gravitational E.
Atomic nuclei that are all isotopes of an element all have the same
A) number of nucleons. B) mass. C) number of protons. D) number of neutrons.
A spherical conductor (radius = 1.0 cm) with a charge of 2.0 pC is within a concentric hollow spherical conductor (inner radius = 3.0 cm, outer radius = 4.0 cm) which has a total charge of ?3.0 pC. What is the magnitude of the electric field 2.0 cm from the center of these conductors?
a. 23 N/C b. zero c. 45 N/C d. 90 N/C e. 110 N/C