I think it is the Milky Way.
-- <em>H₂O</em> is a single molecule of water. It's made of two Hydrogen atoms and one Oxygen atom.
-- <u><em>2</em></u><em> H₂O</em> is two molecules of water. Between them, they have a total of four Hydrogen atoms and two Oxygen atoms. <em>(C) </em>
7.47 = 6.2832*√L/g
55.80 = 39.48*L/9.8
L = 55.80*9.8/39.48 = 13.85 m
Your answer should be 13.85m! Hope this helps!
Alloy is an example of solid.