Which of the following describes a nonmetal?
A) poor conductor of electricity
B) shiny
C) malleable
D) ductile
E) good conductor of heat
Answer: A
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Length Contraction: Astronaut Hans leaves Earth in a spaceship traveling at a speed of 0.280c relative to the observer Brian at rest on Earth. Hans is holding a pencil at an angle of 30° with the direction of travel, as seen by Hans. What angle does the pencil make with the direction of travel, as seen by Brian on Earth?
A. 29° B. 30° C. 31° D. 33° E. 90°
The composition of Earth's atmosphere today is about 78% ________, 21% ________, and about 1% ________, with trace amounts of other gases.
A. nitrogen; carbon dioxide; oxygen B. nitrogen; oxygen; argon C. nitrogen; oxygen; carbon dioxide D. oxygen; nitrogen; water vapor E. oxygen; carbon dioxide; nitrogen
Which of the following regions was the result of plumes of hot mantle rising in a hot spot within a plate?
A) Alaska's Aleutian Islands B) Japan and the Philippines C) the islands of Hawaii D) the volcano Mount St. Helens E) all of the above
Wire A and Wire B are each carrying the same current. If the diameter of Wire A is twice that of Wire B, how does the drift velocity vdA in Wire A compare to that in in Wire B?
a. vdA = vdB b. vdA = 2 vdB c. vdA = vdB /2 d. vdA = vdB /4