**Question1**

A rifle is expected horizontally at a target 28m away. The bullet hits the target 2.7 cm below the aiming point. Neglect air resistance. What is the bullet's time of flight? And what is its muzzle velocity?

**Question2**

Air has an average density of 1.29kg/m^3 near the surface of the earth: (a) research air and find out what percent of it is oxygen? If each breath from a person takes an average of 1/2 L of air, what mass, in grams, does a person breathe in in a day? If the air was to be stored uncompressed in a spherical tank, what would be radius of the tank?

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