If 25 kg of ice at 0°C is combined with 4 kg of steam at 100°C, what will be the final equilibrium temperature (in °C) of the system?
a. 40
b. 20
c. 60
d. 100
e. 8
B
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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
In an inelastic collision, the final total momentum is
A) more than the initial momentum. B) less than the initial momentum. C) the same as the initial momentum. D) insufficient information to answer
Earth's albedo is ______________
Fill in the blank(s) with correct word
Which of the following could not be determined by an observation that only uses spectroscopy?
A) the chemical composition of a distant star B) the speed at which a distant galaxy is moving away from us C) the surface temperature of a distant star D) the rotation rate of a distant star E) the angular size of a distant galaxy