Which of the following is the weakest?
A) a chemical bond
B) an ion-dipole attraction
C) a dipole-dipole attraction
D) a dipole-induced dipole attraction
E) an induced dipole-induced dipole attraction
Answer: E
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What was the temperature of the universe when the recombination took place that produced the cosmic background radiation we observe today?
a. about 2.7 K b. about 300 K c. about 3000 K d. about 3 million K e. about 3 billion K
Which one of the following is TRUE?
A) Most elliptical galaxies contain only young stars. B) Most galaxies appear to be approaching the Milky Way Galaxy. C) Irregular galaxies rarely have star formation taking place in them. D) Smaller galaxies called dwarf galaxies tend to be found around larger galaxies like the Milky Way. E) Galaxy collisions destroy most of the stars in the galaxies involved.
A system consisting of a negatively-charged particle and an electric field
A. gains potential difference and kinetic energy when the charged particle moves in the direction of the field. B. loses electric potential energy when the charged particle moves in the direction of the field. C. gains kinetic energy when the charged particle moves in the direction of the field. D. gains electric potential energy when the charged particle moves in the direction of the field. E. gains potential difference and electric potential energy when the charged particle moves in the direction of the field.
A flashlight, which uses two 1.5 V batteries in series, is turned on for 2.0 minutes. If the current in the flashlight is 100 mA, what is the energy dissipated?
A. 12 J B. 9.0 J C. 72 J D. 36 J E. 18 J