Greenhouse gases (water molecules and carbon dioxide) generate heat to make our Earth warm.
Answer the following statement true (T) or false (F)
False
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An electron has an intrinsic magnetic moment that we can model as being due to the electron spinning around an axis. In an external magnetic field 
, in which direction will the electron’s spin angular momentum vector 
point when the electron is in its lowest-energy orientation?
The number of comets in the Oort cloud is probably about
A) a thousand. B) a million. C) a billion. D) a trillion. E) a quintillion.
_______________ galaxies have star formation, but no clear shape
Fill in the blank(s) with correct word
A 100-kg person sits on a 5-kg bicycle. The weight is borne equally by the two wheels of the bicycle. The tires are inflated to a gauge pressure of 8.0 x 105 Pa and are 2.0 cm wide. What length of each tire is in contact with the ground?
A) 1.6 cm B) 1.8 cm C) 3.2 cm D) 2.4 cm E) 6.4 cm