Which of the following is true of the near Earth objects?
A) They are at least as big as Earth.
B) Their density is the same as that of Earth.
C) They pose the threat of eventual collision with Earth.
D) Their orbits are the same as those of the planets near Earth.
C
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The average distance from Mars to the Sun is _____
A) 0.8 AU B) 1 AU C) 1.5 AU D) 2 AU
The electrical conductivity of copper and nickel material at room temperature are 6.0×107 (??m)-1 and 2.0×107 (??m)-1 , respectively. Copper and nickel form a solid solution at low concentrations at room temperature. If an alloy of nickel plus 5 atom % copper produced from these materials has an electrical resistivity of 11×10-8 ??m, what would be the electrical resistivity of an alloy of nickel plus 10-atomicpercent copper? You may assume that these are dilute solutions.
What will be an ideal response?
The temperature of a quantity of an ideal gas is
A. one measure of its ability to transfer thermal energy to another body. B. proportional to the average molecular kinetic energy of the molecules. C. proportional to the internal energy of the gas. D. correctly described by all the statements above. E. correctly described only by (a) and (b) above.
Northern Hemisphere winters are colder than Northern Hemisphere summers because
a. Earth is closer to the sun during the summer than it is during the winter. b. the snow that falls in the northern latitudes cools Earth during the winter. c. the light from the sun shines more directly on the Northern Hemisphere during the summer. d. the period of sunlight is longer during the summer than during the winter. e. c and d