Look carefully at this map and the two labeled paths from Philadelphia to Beijing. Which statement is true?
A) The map is fine, and the distances seem backward only because it is a flat map of a round Earth.
B) The distances on the two paths are labeled backward; the curved one should be the longer one.
C) The upper curved path makes sense only if we assume that it is a path that is drilled through the center of our planet.
D) The routes shown are impossible because there can be only one correct distance between two cities.
A) The map is fine, and the distances seem backward only because it is a flat map of a round Earth.
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Suppose that there are 10 billion (10,000,000,000,000 ) habitable planets in our galaxy, that 1 in 5 habitable planets has life, that 1 in 1000 planets with life has at some point had an intelligent civilization, and that 1 in 1000 civilizations that
have ever existed is in existence now. How many civilizations would exist at present? A) 200,000 B) 2,000,000 C) 20,000 D) 20,000,000
Which of the following statements are correct? (There could be more than one correct choice.)
A) Spherical aberration, but not chromatic aberration, occurs for lenses. B) Chromatic aberration, but not spherical aberration, occurs for lenses. C) Both chromatic aberration and spherical aberration occur for lenses. D) Both chromatic aberration and spherical aberration occur for spherical mirrors.
About how hot does something have to get to glow red hot?
a. 375 degrees F c. 3000 K b. 800 degrees F d. 6000 K
Space and time are
A) bound together. B) independent entities.