Once an alpha particle is outside the nucleus it is
A) free to wander about the surrounding material.
B) quickly bound to a neighboring nucleus.
C) electrostatically repelled.
D) radioactive.
Answer: C
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Carbon-14 is produced in the atmosphere principally by
A) plants and animals. B) cosmic-ray bombardment. C) nitrogen bombardment. D) photosynthesis. E) none of the above
Spiral density wave theory and self-sustaining star formation are ways to explain why ____
a. stars orbit the galaxy with different periods at different distances from the center b. sun-like stars are evenly distributed through the disk of the galaxy c. dark matter affects the orbit of stars outside the visible disk of the galaxy d. molecular clouds are compressed forming young stars along spiral arms e. the central bulge of the galaxy has a "bar" shape
What horizontally-applied force will accelerate a 400-kg crate at 1 m/s2 across a factory floor against a friction force half its weight?
A) 600 N B) 1600 N C) 2000 N D) 2400 N E) none of the above
Why is Saturn's moon Titan able to retain an atmosphere?
a. Titan only contains light gases which are easy to retain. b. Titan has a large enough mass and is cold enough. c. Titan is biologically active. d. It is so close to Saturn that Saturn's gravity retains Titan's atmosphere.