Describe the large-scale structure revealed by the redshift surveys
What will be an ideal response?
The superclusters are separated by huge, apparently empty voids that make up most of the volume of the cosmos. The galaxies lie in a frothy structure, as if made up of many cosmic bubbles, with the galaxies the matter film on the void bubbles.
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Which of the following statements best describes the concept of structural conformation?
A) rearranging the shape of a molecule by rotating around bonds B) rearranging the shape of a molecule by changing the arrangement of bonds C) changing the structure by adding or subtracting bonds D) arranging the atom into the best conformation for the given structure E) changing the conformation to generate a new molecule with different chemical properties
Resistors in Combination: Three 2.0-? resistors are connected to form the sides of an equilateral triangle ABC as shown in the figure. What is the equivalent resistance between any two points, AB, BC, or AC, of this circuit?
A. 2.0 ? B. 6.0 ? C. 4.3 ? D. 3.3 ? E. 1.3 ?
The main difference between kinetic energy and potential energy is that
a. kinetic energy involves position and potential energy involves motion. b. kinetic energy involves motion and potential energy involves position. c. although both energies involve motion, only kinetic involves position. d. although both energies involve position, only potential involves motion.
Two large parallel plates are separated by 1.0 mm of air. If the potential difference between them is 3.0 V, what is the magnitude of their surface charge densities? (?0 = 8.85 × 10-12 C2/N ? m2)
A) 2.7 × 10-8 C/m2 B) 1.6 × 10-4 C/m2 C) 5.3 × 10-8 C/m2 D) 3.3 × 10-4 C/m2