Neglecting recoil of the gold nucleus, how much kinetic energy must an alpha particle (charge = 2 × 1.6 × 10^-19 C) have to approach to within 1.95 × 10^-14 m of a gold nucleus (charge = 79 × 1.6 × 10^-19 C)? (ke = 8.99 × 10^9 N×m2/C2 and 1 MeV = 1.6 × 10^-13 J)
a. 14.6 MeV
c. 18.2 MeV
b. 11.7 MeV
d. 22.7 MeV
B
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Fill in the blank(s) with correct word
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a. Roche limit b. Lagrangian point c. Chandraskhar limit d. Hubble radius e. event horizon
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a. A force exists that we knew nothing about that causes the acceleration. b. The universe must be closed. c. The universe is finite. d. The amount of dark matter must be greatly less than the amount of normal matter. e. The universe must be infinitely old.
This diagram represents an edge-on view of our Milky Way Galaxy. Of the four labeled points, which one is located closest to a place where evidence suggests we would find a 4 million solar-mass black hole?
A) point 1 B) point 2 C) point 3 D) point 4