When salt is introduced to water, the temperature at which freezing occurs is
A) quite unaffected.
B) lowered.
C) increased.
D) dependent on the shape of salt and ice crystals
Answer: B
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The average kinetic energy of a nitrogen molecule at room temperature (20°C) is
a. 2 × 10^-21 J. b. 4 × 10^-21 J. c. 6 × 10^-21 J. d. 8 × 10^-21 J. e. 1 × 10^-20 J.
A 12-nC charge is distributed uniformly along the y axis from y = 0 to y = 4 m. Which of the following integrals is correct for the x component of the electric field at x = 2 m on the x axis?
A.
B.
C.
D.
E.
What happens to the half-life of a radioactive substance as it decays?
A) It remains constant. B) It increases. C) It decreases at a constant rate. D) It decreases at an exponential rate.
Because of their mass, the threshold temperature for electrons is:
A) higher than that of neutrons. B) lower than that of protons. C) higher than that of protons. D) lower than that of hydrogen. E) higher than that of hydrogen.