If sunlight peaks at 0.55 ?m wavelength, this infers a surface temperature of the sun of how many thousand degrees Kelvin?
A) 9.5
B) 5.3
C) 2.5
D) 25.
E) 15.
B
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On bracket ABCDEF, each y-direction force acts at the center of the bar segment to which it is applied (see figure). All turns of ABCDEF are 90o angles. The resultant moment at B (MB) for this parallel force system is (in N?m)
(A) 395j 1 1080k
(B) 415i 1 875k
(C) 485i 2 913k
(D) 2485i 1 913k
A bright red nebula is called an HII region when it contains
A. molecular hydrogen gas, H2. B. hydrogen atoms which have been ionized by ultraviolet radiation. C. hydrogen which is generating 21-cm radio waves. D. hot hydrogen gas thermally glowing.
List the SI base units
What will be an ideal response?
Which of the following is not a characteristic of the jovian planets?
A) They have higher average densities than the terrestrial planets. B) They have thick atmospheres. C) They are primarily made of hydrogen, helium, and hydrogen compounds. D) They are located further from the Sun than the terrestrial planets. E) They have rings.