Our galaxy is suspected to be surrounded by a galactic halo or corona because the disk of the galaxy
a. rotates faster than expected in its outer region.
b. rotates more slowly than expected in its outer region.
c. is only visible during a total eclipse of our sun
d. is surrounded above, below and well beyond by the brightly glowing corona.
A
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Angular and Linear Quantities: A rolling wheel of diameter of 68 cm slows down uniformly from 8.4 m/s to rest over a distance of 115 m. What is the magnitude of its angular acceleration if there was no slipping?
A. 1.8 rad/s2 B. 0.90 rad/s2 C. 5.7 rad/s2 D. 11 rad/s2
Supernova 1987A was the first supernova observed by astronomers since Galileo first turned a telescope to the heavens
Indicate whether the statement is true or false
Two separate pairs of binary stars are observed. The separation of the pairs is identical, but the orbital period of Pair X is 4 times the orbital period of Pair Y
How does the total mass of the stars in Pair X compare to the total mass of the stars in Pair Y? A) Pair X has a total mass 2 times greater than Pair Y. B) Pair Y has a total mass 2 times greater than Pair X. C) Pair Y has a total mass 16 times greater than Pair X. D) Pair X has a total mass 16 times greater than Pair Y.
What is the kinetic energy of an electron that passes undeviated through perpendicular electric and magnetic fields if E = 4.0 kV/m and B = 8.0 mT?
a. 0.65 eV b. 0.71 eV c. 0.84 eV d. 0.54 eV e. 1.4 eV