A space shuttle carting humans and science experiments contains an air ratio similar to (but not the same as) Earth as follows: 77% of the air is a mixture of N2 and Ar.  The rest of the air is O2.  The total cargo volume of the air in the space shuttle air is 25,400 L.  What volume of Oxygen is in the space shuttle.

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Q: Shouldn't r be squared

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!