The first included photograph shows the shock waves around a model of the X-15 experimental aircraft being tested inside a wind tunnel. The second included photograph shows the shock wave and air turbulence from a bullet immediately after it has been fired from a rifle. Assume both photographs were taken near sea level and at room temperature. a) Estimate how fast the air is passing by the model of the X-15. b) Estimate the speed of the bullet.

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Density of Solids

The density of a substance refers to how much matter is present in a given amount of space. It is expressed as the ratio of the mass of the substance to its volume.