Transformers: An ideal transformer has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage and current are present in the secondary?
Fill in the blank(s) with the appropriate word(s).
600 V, 0.40 A
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Why are distant stars redder than nearby stars of the same spectral type?
What will be an ideal response?
Double-Slit Interference: Two radio antennas are 10 km apart on a north-south axis on high mountain tops at the seacoast. The antennas broadcast identical AM radio signals, in phase, at a frequency of 4.70 MHz. A steamship, 200 km offshore, travels toward the north at 15 km/h and passes east of the antennas. A radio on board the ship is tuned to the broadcast frequency. The reception of the radio signal on the ship is a maximum at a given instant. How much later until the next occurrence of maximum reception? (c = 3.00 × 108 m/s)
A. 5.1 min B. 3.8 min C. 6.4 min D. 7.7 min E. 8.9 min
Approximately how large in diameter would the star Betelgeuse be on this same scale?
A) 40 centimeters (the size of a typical beach ball) B) 6 meters (roughly the size of a dorm room) C) 130 meters (slightly larger than a football field) D) 3 kilometers (the size of a small town)
Which of the following best describes Pluto in terms of the general characteristics of terrestrial and jovian planets?
A) size and density similar to terrestrial planets; distance and composition similar to jovian planets B) size and solid surface similar to terrestrial planets; distance similar to jovian planets C) size and distance similar to terrestrial planets; gaseous surface and composition similar to jovian planets D) solid surface and density similar to terrestrial planets; temperature and composition similar to jovian planets E) solid surface and temperature similar to terrestrial planets; distance and density similar to jovian planets