Which of the following is true of the signs of the zodiac?
A) They have a huge impact on the seasons.
B) They are no longer important in astronomy.
C) They determine the course of Earth's orbit.
D) They are no longer important in astrology.
B
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The mean free path of a molecule is 
m in an ideal gas at standard temperature and pressure. What is the mean free path when the diameter of the molecule is doubled and the temperature of the gas is doubled?
A. 
B. 
C. 
D. 
E. 
A particle moves in the xy plane in a circle centered on the origin. At a certain instant the velocity and acceleration of the particle are 
m/s and 
m/s2. What are the x and y coordinates of the particle at this moment?
A. x = ?4.4 m, y = 0 B. x = +5.3 m, y = 0 C. x = ?5.3 m, y = 0 D. x = +4.4 m, y = 0 E. x = ?1.8 m, y = 0
The buoyant force that acts on a 10-ton ship floating in the ocean is
A) less than 10 tons. B) 10 tons. C) greater than 10 tons. D) depends on the density of seawater
What is one atomic mass unit?
a. The mass of a hydrogen atom at the Earth's surface. b. The mass of an oxygen atom in outer space. c. The mass of a carbon atom. d. One-twelfth of a carbon atom. e. One-twentieth the mass of a uranium atom.