Which type of nebulae is produced when short-wavelength scatters from the dust and displays a blue hue?
a. emission nebulae
b. H I
c. reflection nebulae
d. dark nebulae
e. spectral type B6
c
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Consider the three items from Part A that are not relevant to the giant impact hypothesis. As you’ll learn in later chapters, the lack of volcanoes is a result of the Moon’s relatively small size. But what explains the other two items — the Moon’s synchronous rotation and gradually increasing distance from Earth?
a. Both are results of the Moon’s small size. b. Both are results of tidal interactions between the Moon and Earth. c. Synchronous rotation is simply a coincidence, and this coincidence in turn causes the Moon to move farther away with time. d. The giant impact would have caused the Moon to rotate synchronously, and the outward fling from the impact would explain the increasing distance.
A 0.500-kg ball traveling horizontally on a frictionless surface approaches a very massive stone at 20.0 m/s perpendicular to wall and rebounds with 70.0% of its initial kinetic energy. What is the magnitude of the change in momentum of the stone?
A) 18.4 kg?m/s B) 14.0 kg?m/s C) 3.00 kg?m/s D) 1.63 kg?m/s E) 0.000 kg?m/s
A 92-kg man climbs into a car with worn out shock absorbers, and this causes the car to drop down 4.5 cm. As he drives along he hits a bump, which starts the car oscillating at an angular frequency of 4.52 rad/s. What is the mass of the car?
A) 890 kg B) 760 kg C) 920 kg D) 990 kg E) 1900 kg
The North Celestial Pole is 35 ? above your northern horizon. This tells you that:
a. you are at latitude 35 ? N. b. you are at longitude 35 ? E. c. you are at latitude 35 ? S.