Dust and gas in the Milky Way
A. are concentrated in a thin layer in the disk.
B. are found in different places: dust primarily in the disk and gas primarily in the halo.
C. are spread evenly throughout the halo and disk.
D. are found in different places: gas primarily in the disk and dust primarily in the halo.
Answer: A
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Two sounds of the same intensity are added together. The intensity of the resulting sound is how many decibels greater than the intensity of one of the original sounds? The resulting sound
1.will have twice the decibel level as one of the original sounds. 2.will have the same decibel level as one of the original sounds. 3.will be two decibels higher than the original sound. 4.will be three decibels higher than the original sound.
The presence of breccias among the lunar rock samples shows that
a. volcanism did not occur on the Moon. b. molten lava once flowed over the lunar surface. c. the crust must have been made of anorthosite. d. water once existed on the Moon in the form of small lakes and streams. e. the lunar surface was fragmented by meteorite impacts.
These are found on the side of the Moon that faces Earth, but not on the far side
A) Highlands B) Maria C) Craters D) Mountains E) Valleys
An ideal massless spring with a spring constant of 2.00 N/m is attached to an object of 75.0 g. The system has a small amount of damping. If the amplitude of the oscillations decreases from 10.0 mm to 5.00 mm in 15
0 s, what is the magnitude of the damping constant b? A) 0.00693 kg/s B) 0.0462 kg/s C) 0.00762 kg/s D) 0.0100 kg/s E) 0.00857 kg/s