Which type of molecules, vital to our life, was found in Murchison and similar carbonaceous chondrites?
A) amino acids
B) DNA
C) lipids
D) sugars
E) vitamins
A
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Two metal spheres on insulating stands have the same positive charge Q. If we reduce the distance between the spheres’ centers by a factor of two, the magnitude of the repulsive force between the spheres increases by
A. a bit less than a factor of two. B. exactly a factor of two. C. a bit more than a factor of two. D. a bit less than a factor of four. E. exactly a factor of four. F. a bit more than a factor of four.
At the instant a 2.0-kg particle has a velocity of 4.0 m/s in the positive x direction, a 3.0-kg particle has a velocity of 5.0 m/s in the positive y direction. What is the speed of the center of mass of the two-particle system?
a. 3.8 m/s b. 3.4 m/s c. 5.0 m/s d. 4.4 m/s e. 4.6 m/s
Where are volcanoes most common?
a. subduction zones b. transform boundaries c. folded mountain ranges d. continental basins and ranges e. plates pushing against one another
If global warming proceeds during the next century as anticipated, the polar ice caps may melt, substantially raising sea levels around the world (and flooding coastal cities such as New York and New Orleans). What effect will this have on the duration of the day?
A. It will lengthen the day slightly. B. It will shorten it slightly. C. It will have strictly no effect.