The density of air under normal conditions is about 1.2 kg/m3. For a wind speed of 10 m/s, find (a) the actual power carried in the wind
(b) the maximum power (Betz limit) extractable by a wind turbine with a blade area of 10 m2; and
(c) the actual power extracted by a wind turbine with a blade area of 10 m2 and a power coefficient of 0.46.

Agas is contained in a vertical, frictionless piston–cylinder device. the piston has a mass of 3.2 kg and a cross-sectional area of 35 cm2. a compressed spring above the piston exerts a force of 190 n on the piston. if the atmospheric pressure is 95 kpa, determine the pressure inside the cylinder.

Blank liquids and gases exert a buoyant force on objects placed in them

Although longitudinal waves can travel through all media types what is the disadvantage of this type of wave transmission? a) he efficiency of he wave transmission is greatly diminished as the media becomes less dense b) the oscillation of one set of particles has a huge impact on neighboring particles c) particles become too close together as they bump into each other making it more likely to hit other particles down the line