The primary coil of an ideal transformer has 100 turns and its secondary coil has 400 turns. If the ac voltage applied to the primary coil is 120 V, what voltage is present in its secondary coil?
A) 100 V
B) 30 V
C) 70 V
D) 480 V
E) 400 V
D
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The open clusters were a population of relatively young stars, so where would you expect to see them from?
A.) In the halo with globular clusters. B.) In the disk. C.) In the bulge. D.) Only around the Sun. E.) Behind us.
At which wavelength range is there no current or planned space observatory?
A) radio B) infrared C) visible D) X-ray E) gamma-ray
In a graph of the history of U.S. energy use since 1950, why does the graph drop sharply after 1973?
A) The 1973 mideast oil embargo was followed by increased prices and a drop in consumption. B) The Texas oil fields produced far less oil beginning in 1973, causing a price increase and a drop in consumption. C) The Texas oil fields produced far less oil beginning in 1973, resulting in rationing and a switch to natural gas. D) The 1973 mideast oil embargo was followed by gasoline rationing and a switch to domestic natural gas. E) Analysts have not yet found a good explanation for this drop in U.S. energy use.
Which type of asteroid is classified as rocky, bright, and reddish?
a. C-type b. F-type c. M-type d. S-type e. V-type