Which of the following best describes how galaxies are distributed on large scales in the universe?
A) Galaxies are distributed in a great shell expanding outward from the center of the universe.
B) Galaxies are randomly distributed.
C) Galaxies are uniformly distributed.
D) Galaxies appear to be distributed in chains and sheets that surround great voids.
E) Galaxies are distributed in a hierarchy of clusters, superclusters, and hyperclusters.
D
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Uncertainty Principle Using Momentum and Position: Suppose that the speed of an electron traveling 1.0 km/s is known to an accuracy of 1 part in 10,000 (that is, within 0.01%). What is the minimum uncertainty in the position of this electron? (melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s)
Fill in the blank(s) with the appropriate word(s).
What is the resonant frequency of a 1.0
F capacitor and 15 mH coil in series?
A. 15 kHz B. 1.3 kHz C. 0.87 kHz D. 57 kHz
Determine the largest permissible time step for a one-dimensional transient conduction problem to be solved by an explicit method if the node spacing is 1 mm and the material is (a) carbon steel 1C, and (b) window glass. Explain the difference in the two results.
GIVEN One-dimensional transient conduction in a 1-mm-thickness of carbon steel and window glass FIND (a) Largest permissible time step for each material
__________is a graph of orbital velocity versus radius in the disk of a galaxy
A) A rotation curve B) A normal distribution C) The H-R diagram D) The light curve