The power delivered to the wheels of a car is used to overcome aerodynamic drag. Compare the amount of annual fuel consumption by the car when driving a distance of 24,000 km/year with velocities of 60, 100 and 140 km/h. The drag coefficient and frontal area of the car body are 0.26 and 1.8 m2 and the engine efficiency is 30%. Take the density of air and gasoline as 1.2 and 750 kg/m3. The heating value of gasoline is also 44,000 kJ/kg.

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Fluid Dynamics

The study of the flow of gases and liquids, usually in and around solid surfaces, is known as fluid dynamics in physics and engineering. Fluid dynamics, for example, can be used to evaluate the movement of air through an airplane wing or the surface of a vehicle. It can also be used in ship design to increase the speed at which ships pass through water.