The Sun's photosphere is, by mass, about 25%
a. helium.
b. carbon.
c. hydrogen.
d. oxygen.
a
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Galactic cannibalism refers to
a. binary galaxies. b. the merging of galaxies. c. galaxies drawing in gas from the intergalactic medium. d. the destruction of a galaxy's globular clusters by the galaxy's nucleus. e. None of the other choices are correct.
A major surprise from space exploration is that ________ exists at the poles of both Mercury and our Moon
Fill in the blank(s) with correct word
A visual binary star system has rotation period, P = 10 years. The semi-major axis of the orbit of one of the stars is 5 AU. What is the combined mass of the binary star system?
A. 40 solar masses B. 0.4 solar masses C. 8 solar masses D. 4 solar masses E. 200 solar masses
The graphs below show the phasors ?Vmax and Imax for five RLC series circuits. The solid arrows represent the voltage phasors, ?V, and the dashed arrows represent the current phasors, Imax. Which graph represents a circuit where the capacitive reactance is greater than the inductive reactance?
A.
B.
C.
D.
E.
