Our galaxy is suspected to be surrounded by a galactic halo or corona because the disk of the galaxy
a. rotates faster than expected in its outer region.
b. rotates more slowly than expected in its outer region.
c. is only visible during a total eclipse of our Sun.
d. is surrounded above, below, and well beyond by the brightly glowing corona.
a
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Suppose that at a certain time a quanton has a well-defined position x = 0.15 nm. At that time, we perform an experiment to determine the quanton’s momentum, and find it has a value that corresponds to a de Broglie wavelength of 0.45 nm to a high degree of precision. What can we say about the quanton’s position after the experiment?
A. It is still 0.15 nm. B. It is now 0.45 nm. C. It is now within ±0.45 nm of 0.15 nm. D. It is now undefined but probably close to 0.15 nm. E. It is now completely undefined. F. Other (specify).
Equilibrium: A light board that is 10 m long is supported by two sawhorses, one at one end of the board and a second at the midpoint. A 40-N object is placed between the two sawhorses, 3.0 m from the end and 2.0 m from the center. A second object, with a weight of 15 N, is placed on the supported end. What magnitude forces do the sawhorses exert on the board?
What will be an ideal response?
As a body cools, its ________ decreases.
A. brightness B. total emitted energy C. internal energy D. All of these choices are correct.
Similar to the crystallization of silicate minerals, the crystallization of evaporite minerals occurs in a step-by-step process. The evaporite minerals that are the most difficult to dissolve
A) precipitate last. B) precipitate first followed by the minerals that dissolve more easily. C) have the lowest solubility and are the last to precipitate. D) have the highest solubility and are the first to precipitate.