Which isotopes are most appropriate for dating formations from the following ages: (a) the early Precambrian; (b) the Mesozoic; (c) the late Pleistocene?
What will be an ideal response?
Answer: For the early Precambrian, use uranium-238. For the Mesozoic, use uranium-235 (uranium-238 will also work but is not as precise). For the late Pleistocene, carbon-14 is the only reasonable isotope to use.
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A black hole can be thought of as
a. a very massive object of finite size. b. a shell of material expanding from a white dwarf. c. a massive body of infinitely small size. d. a burnt out white dwarf.
Two horizontal curves on a bobsled run are banked at the same angle, but one has twice the radius of the other. The safe speed (no friction needed to stay on the run) for the smaller radius curve is V
Therefore, the safe speed on the larger radius curve is A) 0.71 V. B) 0.10 V. C) 1.4 V. D) 0.5 V. E) 2. V.
A railroad train travels forward along a straight track at 90.0 m/s for 1 000 m and then travels at 70.0 m/s for the next 1 000 m. What is the average velocity?
a. 79.3 m/s b. 78.8 m/s c. 83.8 m/s d. 75.8 m/s e. 81.5 m/s
The figure shows a distance vs. time graph of an object with three distinct regions, I, II, and III
?
The object’s velocity is positive in region II.
a.
True
b.
False