Which hypothesis concerning the formation of the Moon makes predictions that best fit the observed lunar data?
a. the large impact hypothesis
b. the fission hypothesis
c. the capture hypothesis
d. the condensation hypothesis
e. the regolith hypothesis
a
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Given the following energy profiles, which of the following reactions is endothermic?
A) a B) b C) c D) d E) none of the above
General Questions: You pull on a crate with a rope. If the crate moves, the rope's pull on the crate must have been larger than the crate's pull on the rope, but if the crate does not move, both of these pulls must have been equal.
A. True B. False
As stars evolve, their temperature and luminosity change; therefore, their spectral type (OBAF, etc.) changes as well.
Answer the following statement true (T) or false (F)
The y-component of a force vector is -15.0N, while its magnitude is 27.2N. Which could be the vector’s direction?
A. 
below the +x axis
B. 
below the -x axis
C. 
below the -x axis
D. 
below the +x axis
E. None of the choices are correct.