Suppose Earth's axis tilt was significantly greater than its current 23.5 degrees, but Earth's rotation period and orbital period were unchanged. Which statement below would not be true?
A) Summers and winters would be more severe (for example, hotter and colder, respectively) than they are now.
B) The region of Earth where the Sun does not rise on the winter solstice would be larger (extending farther south) than it is now.
C) The length of each season (for example, the number of days from the summer solstice to the fall equinox) would be significantly longer than it is now.
D) Polaris would not be our North star.
C
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If a proton inside the nucleus of an atom suddenly turned into a neutron, while the atom retained its original number of electrons, what properties of the atom would change?
A) only its atomic number B) only its atomic mass number C) only its electrical charge D) both its atomic number and atomic mass number, but not its electrical charge E) both its atomic number and electrical charge, but not its atomic mass number
From a chemical energy standpoint, the basic requirement for life is a situation in which chemicals naturally exist in a state of
A) instability B) disequilibrium C) equilibrium D) stability
The point in the phase diagram where the fusion curve, the vapor pressure curve, and the sublimation curve join is called the
A) critical point. B) triple point. C) melting point. D) boiling point. E) double point.
Consider a situation where a constant force of 25N acts on an object having a mass of 2 kg for 3 seconds. What is the work done by the force?
a. 150 J b. 50 J c. 75 J d. undetermined—not enough information given e. none of the above