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

Physics & Space Science

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Why are distant stars redder than nearby stars of the same spectral type?

What will be an ideal response?

Physics & Space Science

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

Physics & Space Science

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)

Physics & Space Science

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

Physics & Space Science