The safety fuse in an electric circuit is properly connected in
A) series with the circuit.
B) parallel to the circuit.
C) either of these
Answer: A
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Electromagnetic waves are generated whenever the ____
a. motion of any particle is changed b. motion of any charged particle changes c. motion of a positively charged particle is changed d. motion of a negatively charged particle is changed e. acceleration of any charged particle is changed
Which of the following is evidence that solar activity affects Earth's climate?
A. The dust bowl of the 1930s in the United States coincided with the complete disappearance of sunspots during that time. B. The Maunder Minimum-a period of abnormally low sunspot numbers-coincided with abnormally cold northern winters. C. The Schwab Cycle-a period of abnormally numerous and large sunspots-preceded a 250-year drought in Africa. D. All of these choices are correct.
What field of science are the experiments on the two Mars Rovers Sojourner, Spirit, Opportunity and Curiosity most closely related to?
A) physics B) biology C) geology D) astronomy
Of all the useful alkanes, which petroleum-based
product has molecules that show the largest continuous-chain structure? a) gasoline b) asphalt c) paraffin wax d) kerosene