The "close encounter hypothesis" suggested that the planets formed after a near-collision between our Sun and another star. If this hypothesis were correct, which of the following would be true?
A) Planetary systems would be very rare.
B) Planetary systems would be very common.
C) Most planetary systems would have their jovian planets closer to their stars and their terrestrial planets farther from their stars.
D) Most planetary systems would have the same number of planets as our own.
E) All planetary systems would be at least 4 billion years old.
A) Planetary systems would be very rare.
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A 24.0 N picture hangs from a nail in the wall. The diameter of the nail is 2.00 mm. The shear stress on the nail is
a. 
b. 
c. 
d. 
e. 
An object is located 3.8 m in front of a plane mirror. The image formed by the mirror appears to be
A) 1.9 m in front of the mirror. B) on the mirror's surface. C) 1.9 m behind the mirror's surface. D) 3.8 m in front of the mirror. E) 3.8 m behind the mirror's surface.
Fe, which has an atomic mass of 54.938296 u decays with a half-life of 2.7 y to 
Mn, which has an atomic mass of 54.938047 u. Does this likely decay by a ?+ process (B), or must it decay by electron capture (E)?
B. ?+ process E. must it decay by electron capture
What proves the existence of the Kuiper belt?
A. the fact that comets are icy objects B. the fact that many comets orbit on the ecliptic C. Objects of the Kuiper belt were detected by the Hubble Space Telescope. D. the existence of short-period comets