Which of the following is true of the eccentricity of an ellipse?
A) It tells you the length of the ellipse.
B) It tells you the shape of the ellipse.
C) It is half the length of the shortest diameter of the ellipse.
D) It is half the length of the longest diameter of the ellipse.
B
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What is the symbol for the nuclide with 46 protons and 92 neutrons?
A. 92 46Pd B. 138 92U C. 138 46Pd D. 46 92U
Assume that the average rate of 1-km sized asteroids hitting the Earth is about 1 every million years. The chance of the Earth being hit by a 1-km sized asteroid in the next 100 years is about:
A) one in ten thousand. B) one in a million. C) zero. D) one in 100 million. E) inevitable, it has to happen sometime.
What simple observation inspired Alfred Wegener's hypothesis of continental drift?
What will be an ideal response?
White-hot sparks from a fireworks sparkler that strike your skin don't cause injury because
A) they have a low temperature. B) the energy per molecule is very low. C) the energy per molecule is high, but the total energy transferred is small.