The greatest variation in size, mass, and luminosity occurs in
A) globular clusters.
B) elliptical galaxies.
C) spiral and barred spiral galaxies.
D) type I vs type II irregulars.
E) Seyfert galaxies.
B
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The water level in identical bowls, A and B, is exactly the same. A contains only water; B contains floating ice as well as water. When we weigh the bowls, we find that
a. WA < WB. b. WA = WB. c. WA > WB. d. WB > WA if the volume of the ice cubes is greater than 1/9the volume of the water. e. WB > WA if the volume of the ice cubes is greater than 9 times the volume of the water.
Significant Figures: The length and width of a rectangle are 1.125 m and 0.606 m, respectively. Multiplying, your calculator gives the product as 0.68175. Rounding properly to the correct number of significant figures, the area of the rectangle should be written as
A. 0.68 m2 B. 0.682 m2 C. 0.6818 m2 D. 0.68175 m2
The elastic modulus of a material, except for elastomers, is proportional to the _____________of the interatomic potential.
Fill in the blank(s) with the appropriate word(s).
The virtual exchange of photons can produce
a. a repulsive force. b. an attractive force. c. either a repulsive or an attractive force. d. neither a repulsive nor an attractive force.