During a very cold winter, water pipes sometimes burst. The reason for this is
A) the ground contracts when colder, pulling pipes apart.
B) water expands when freezing.
C) water contracts when freezing.
D) the thawing process releases pressure on the pipes.
E) none of the above
B
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Zero magnetic force acts on a current carrying wire when it
A. is perpendicular to the magnetic field. B. carries a very small current. C. either or both of these D. none of the above
Of the following countries, the one that is culturally closest to the Romanians is:
A. Azerbaijan. B. Moldova. C. Latvia. D. Russia.
Which of the following statements best describes how this astronomical object may have formed? (Image is computer generated)
A. Material accumulated into a sphere because of gravity, and underwent nuclear fusion of hydrogen. B. Accumulation of mass from an interstellar cloud with pockets of high-mass material becoming stars. C. A supernova explosion, probably from the late-stage evolution of a high-mass star. D. A high-temperature star, formed by nuclear fusion.
Which of the following contributes the most to the greenhouse effect?
A) Carbon dioxide (CO2) B) Chlorofluorocarbons (CFCs) C) Methane (CH4) D) Nitrous oxide (N2O) E) Water vapor