Elements heavier than Iron (like Gold) are formed:
A: during Type Ia supernova explosions
B: during Type II supernova explosions
C: during the deaths of massive stars
D: both A and C
E: both B and C
Ans: E: both B and C
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Stars in a star cluster
a. all have the same age. b. all have the same chemical composition. c. all have the same luminosity. d. all of the above. e. all have the same age and all have the same chemical composition.
An aluminum light pole weighs 4300 N and supports an arm of weight 700 N, with the arm center of gravity at 1.2 m left of the centroidal axis of the pole. A wind force of 1500 N acts to the right at 7.5 m above the base. The pole cross section at the base has an outside diameter of 235 mm and thickness of 20 mm. The maximum compressive stress at the base is approximately:
(A) 16 MPa
(B) 18 MPa
(C) 21 MPa
(D) 24 MPa
In the H-R diagram, the bright blue-white stars that dominate the naked eye sky lie to the
A) top left. B) top right. C) middle of the main sequence. D) top center. E) bottom left.
A string with a fixed frequency vibrator at one end is subjected to varying tensions. When the tension is 20 N, a resonance with 3 antinodes results. What tension would cause a resonance with 2 antinodes in this string?
a. 30 N b. 45 N c. 80 N d. 8.9 N e. 13 N