Glow-in-the-dark materials exhibit the phenomenon called
a. phosphorescence.
b. simulated absorption.
c. fluorescence.
d. stimulated emission.
a
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By locating the north celestial pole (NCP) in the sky, how can you determine your latitude?
A) The altitude of the NCP is your angular distance from the North Pole. B) The direction of the NCP is the angular distance from the North Pole. C) The direction of the NCP is the same as your latitude. D) The altitude of the NCP is the same as your distance from the North Pole. E) The altitude of the NCP is the same as your latitude.
The grooves and ridges on Ganymede are thought to
A) be due to the moon's rapid rotation. B) have grown considerably larger since the Voyager spacecraft discovered them. C) be part of an ongoing volcanic process. D) be due to crustal tectonics motion (plate tectonics). E) have formed within the last thousand years.
A policeman investigating an accident measures the skid marks left by a car on the horizontal road
He determines that the distance between the point that the driver slammed on the brakes (thereby locking the wheels) and the point where the car came to a stop was 28.0 m. From a reference manual he determines that the coefficient of kinetic friction between the tires and the road under the prevailing conditions was 0.300. How fast was the car going when the driver applied the brakes? A) 12.8 m/s B) 45.7 m/s C) 21.4 m/s D) 10.7 m/s E) 32.9 m/s
How large a force is necessary to stretch a 1.1-mm-diameter steel wire (Y = 2.0 × 10^11 N/m2) by 2.0%?
a. 3.8E+6 N b. 3.8E+3 N c. 3.8E+6 N d. 7.6E+7 N e. 3.8E+3 N