A rock dropped down a well takes 1.8 s to hit the water. How far below the top of the well is the surface of the water?
16 m
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Air that flows northward from the horse latitudes in the Southern Hemisphere deflects westward to produce the
A) trade winds. B) westerlies. C) Gulf Stream. D) Kuroshio current.
Two radio antennas are 10 km apart on a north-south axis on a seacoast. The antennas broadcast identical AM radio signals, in phase, at a frequency of 4.70 MHz
A steamship, 200 km offshore, travels due north at a speed of 15 km/hr 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. The time interval until the next occurrence of maximum reception is closest to: A) 5.1 min B) 3.8 min C) 6.4 min D) 7.7 min E) 8.9 min
Three galaxies, each of mass m = 4.0 × 10^41 kg, lie in a plane at the corners of an equilateral triangle with sides of 5.0 × 10^22 m length. The magnitude of the force the other two galaxies exert on each galaxy is
a. 4.3 × 10^27 N. b. 6.4 × 10^27 N. c. 7.4 × 10^27 N. d. 8.6 × 10^27 N. e. 4.3 × 10^28 N.
Radioactivity Basics: In ?- decay, the number of protons in the nucleus is
A. decreased by 1. B. decreased by 2. C. increased by 1. D. increased by 2. E. remains unchanged.