The primary factor for galactic evolution is ________
Fill in the blank(s) with correct word
collisions (between galaxies)
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You discover a binary star system in which one member is a15 solar mass main-sequence star and the other star is a 10 solar mass giant star. How do we believe that a star system such as this might have come to exist?
A) The two stars probably were once separate but became a binary when a close encounter allowed their mutual gravity to pull them together. B) Other than the very low odds of finding a system with two such massive stars, there is nothing surprising about the fact that such systems exist. C) The main-sequence star probably is a pulsating variable star and therefore appears to be less massive than it really is. D) Although both stars probably formed from the same clump of gas, the more massive one must have had its birth slowed so that it became a main-sequence star millions of years later than its less massive companion. E) The giant must once have been the more massive star but transferred some of its mass to its companion.
The magnitude of the orbital angular momentum L of an electron in a certain atom is equal to 3.464?. What is the orbital quantum number l of the electron?
A) 1 B) 2 C) 3 D) 4 E) 5
At the lowest point in a vertical dive (radius = 0.58 km), an airplane has a speed of 300 km/h which is not changing. Determine the magnitude of the acceleration of the pilot at this lowest point
a. 26 m/s2 b. 21 m/s2 c. 16 m/s2 d. 12 m/s2 e. 8.8 m/s2
A semicircular wire of radius R connects two straight wire segments. If a current I flows along the wire, the magnitude of the magnetic field at the center of the semicircular wire due to the current in the semicircular wire is
A) ?O I/2R. B) ?O I/4R. C) ?O I/8R. D) ?O I/4?R. E) ?O I/8?R.