The thickness up to which the velocity approaches 99% of the free stream velocity. The distance measured perpendicular to the boundary by which the free stream is displaced on account of the formation of the boundary layer.
<h3>What is displacement thickness in boundary layer theory?</h3>
The displacement thickness for the boundary layer is defined as the distance the surface would have to move in the y-direction to reduce the flow passing by a volume equivalent to the real effect of the boundary layer.
The thickness of the boundary layer represented by δ is arbitrarily defined as that distance from the boundary surface in which the velocity reaches 99% of the velocity of the mainstream.
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Answer: The correct answer is : Direct Democracy
Explanation: It is also called pure democracy, where power is exercised directly by the people in an assembly, which could pass or repeal laws and elect public officials. This type of government was practiced in Greece. The mechanisms used in direct democracy are: referendum, referendum, popular initiative, avocation and revocation.
Wave is a disorder that travels through the medium periodically, carrying energy, but not matter. Five parameters determine waves: period, frequency, amplitude, wavelength, and speed. The amount of energy the wave carries is determined by the amplitude. The high amplitude wave possesses a high level of energy, a wave with a small amplitude carries a small amount of energy. In addition, the amplitude does not affect the speed of the waves; both Waves A and B travel at the same speed. The velocity of the wave changes with the characteristics of the media through which they pass.
Right answer is B) the amplitude of the waves.
I believe the answer is: D.<span>The people elect representatives, who govern according to the people’s wishes.
Under popular sovereignity, the citizens do not have the power to directly vote for the type of legislation that they desired (in contrast to direct democracy).
But, the citizens could appoint the representative who had similar view and principle with them and give their trust to that representative to make the legislation that would benefit them.</span>