In the formation of our Galaxy, the ________ formed first
A) planetary nebulae
B) globular clusters
C) spiral arms
D) galactic center
E) galactic disk
B
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The Paschen series of hydrogen corresponds to electron transitions from higher levels to n = 3 . What is the shortest wavelength in that series? (R = 1.097 × 10^7 m?1 and 1 nm = 10?9 m)
a. 1875 nm b. 820 nm c. 1580 nm d. 656 nm e. 1094 nm
If Earth's mass were suddenly and magically reduced to half its present value, the magnitude of Earth's acceleration about the Sun would
A. be reduced by a factor of 4. B. be reduced by a factor of 2. C. remain the same. D. increase by a factor of 2.
An 80-kg man is skating northward and happens to suddenly collide with a 20-kg boy who is ice skating toward the east. Immediately after the collision, the man and boy are seen to be moving together at 2.5 m/s in a direction 60° north of east
How fast was the boy moving just before the collision?
What is meant by ‘like charges?'
a. charges that are both positive b. equal amounts of charge c. charges that are both negative d. A and C