The two spheres stand with a stop element as in the figure. The spheres are connected with negligible weight rod. What is the minimum air velocity U (m/s) for rotating of the spheres? (Note: Take Pair=1.225 kg/m?, Pwater=998 kg/m' and u=1.78*10- kg/ms. Spheres are made of steel material with SG=5,98. Take drag coefficient of spheres is 0,72). D= 2 cm 10 cm Hinge U Stop 45° 10 cm D =1 cm

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Q: power available at sea-level PA; 0 = 140 kW wingspan b = 11 m wing area S = 16 m2 zero-lift drag…

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Properties of Fluids

The term fluid represents a type of substance that can easily change its shape under any external pressure/force and can flow. Fluids can acquire any shape in which it is stored and can resist normal stresses but cannot resist shear stress in rest condition. Whenever external shear stress is applied to fluids, it starts to flow. The fluids may be liquid or gas. Example- water, air, etc.