The lunar month is longer than the sidereal month because
A) the Moon completes the cycle of lunar phases before it completes a full orbit around Earth.
B) the Moon has to complete more than one full orbit around Earth to complete the cycle of lunar phases.
C) the Moon orbits Earth faster than Earth orbits the Sun.
D) the Moon orbits Earth faster than Earth rotates.
E) the lunar month is based on the Moon's orbit, while the sidereal month is based on Earth's orbit.
B
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Resistance and Resistivity: Consider two copper wires of equal cross-sectional area. One wire has 3 times the length of the other. How do the resistances of these two wires compare?
A. Both wires have the same resistance. B. The longer wire has 1/3 the resistance of the shorter wire. C. The longer wire has 3 times the resistance of the shorter wire. D. The longer wire has 9 times times the resistance of the shorter wire. E. The longer wire has 27 times times the resistance of the shorter wire.
Which of the fundamental interactions governs the following decay? 
A. Weak nuclear B. Electromagnetic C. Gravitational D. Strong nuclear
Why is a global magnetic field thought to be necessary for life to exist on the surface of a planet?
A) A magnetic field shields the planet from harmful ultraviolet light. B) A magnetic field helps form ozone in the upper atmosphere. C) A magnetic field helps keep the planet's atmosphere from being stripped away by stellar winds. D) A magnetic field helps warm the planet's surface through the greenhouse effect.
In his model of the motions of the planets, Copernicus
A. assumed that the Earth is the center of the solar system. B. was able to make predictions that were much more accurate than Ptolemy's model. C. revived the idea that our solar system is heliocentric (Sun-centered). D. found that the planets move in paths shaped like ellipses.