In general, wind direction ________ between adjacent bands in Jupiter's atmosphere
Fill in the blank(s) with correct word
alternates
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An 800-kHz radio signal is detected at a point 8.5 km distant from a transmitter tower. The electric field amplitude of the signal at that point is 0.90 V/m
Assume that the signal power is radiated uniformly in all directions and that radio waves incident upon the ground are completely absorbed. What is the average electromagnetic energy density at that point? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2) A) 3.6 pJ/m3 B) 5.1 pJ/m3 C) 7.2 pJ/m3 D) 10 pJ/m3 E) 14 pJ/m3
Water waves pass by a piece of cork floating on the water that bobs up and down one complete cycle each second. The waves are 2 meters long. What is the speed of the wave?
A) 0.25 m/s B) 0.50 m/s C) 1.0 m/s D) 2 m/s E) 4 m/s
The frictional force of the floor on a large suitcase is least when the suitcase is
A. pushed by a force parallel to the floor. B. dragged by a force parallel to the floor. C. pulled by a force directed at an angle ? above the floor. D. pushed by a force directed at an angle ? into the floor. E. turned on its side and pushed by a force parallel to the floor.
Inward migration is a hypothesis used to explain why
A) Jupiter-sized planets are seen orbiting close to some stars B) some stars do not have Jupiter-sized planets C) some stars do not have planets at all D) Terrestrial-sized planets are seen orbiting far from some stars