30. A car approaches you from behind as you run along a sidewalk. The car is moving towards you at 25 m/s. You are running away from the car at 10 m/s. The car blows its horn at 500 hz. What frequency do you hear? The speed of sound in the air is 343 m/s. a) 452 hz b) 480 hz c) 505 hz d) 524 hz e) 556 hz

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Shock Waves

Shock waves are common in continuum mechanics, and their dominance is attributable to the fact that they are stronger (or even less) compressible. Substantial perturbations propagated as sudden dynamic changes of a compressible medium supersonically. Shock waves are all around us in our daily lives. Lightning, earthquakes, volcanic eruptions, and meteorite impact all produce them in nature. Even the earth, which is protected by its magnetic field, generates a shock wave as in solar wind that travels around 20 Earth radiuses. These shock waves might be either constant, linked to the body, or unsteady, i.e., moving around with time. All of the shocks mentioned above can be damaging, so precautions must be taken to reduce their impact.