Carbon-14 Dating: Carbon-14 decays by ?- emission. What nucleus is left after this decay?
A. carbon-13
B. carbon-14
C. carbon-15
D. nitrogen-14
E. nitrogen-15
Answer: D
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Which of the following best describes Fermi's Paradox?
A) Galactic civilizations seem forbidden by the laws of physics. B) Interstellar travel is possible yet would take an infinite amount of time because of relativistic time dilation. C) We would be unable to detect an Earthlike planet even at a distance of a few light-years. D) Reasonable assumptions predict that a galactic civilization should have already arisen in the Milky Way, yet we have absolutely no evidence for it. E) The Drake equation predicts that there should be no intelligent life in the Milky Way, yet we exist.
What property do greenhouse gases have that allow them to warm a planet?
What will be an ideal response?
A rigid rod of length l rotates about an axis perpendicular to the rod, with one end of the rod fixed to the axis. Which of the following are equal at all points on the rod? I. the angular position II. the angular velocity III. the angular acceleration IV. the centripetal acceleration V. the tangential acceleration
a. I and II b. I, II, and III c. I, II, III and IV d. I, II, III, IV and V e. I, II and IV.
Basalt, a dense congealed lava rock rich in iron, is the primary material in the Moon's
A. maria. B. far side's regolith. C. highlands. D. crust.