According to Bernoulli ’s theorem , p d+ v2 2 +gh = Constant. The dimensional formula of the constant is: Bernoulli theorem is based on conservation of (a) momentum (b) mass (c) energy (d) angular momentum The shape of the aeroplane wings is such that when it moves forward, the air molecules at the top of the wings have a greater velocity (relative to the wings) compared to the air molecules at the bottom. Therefore in accordance with Bernoulli 's principle, the pressure at the top of the wings is less than that at the bottom. This results in a dynamic lift of the wings which balances the weight of the plane. While deriving the Bernoulli theorem , it is assumed that the velocity of every particle of liquid across any crosssection is uniform. Practically this is not possible. The viscous drag of the liquid which comes into play when the liquid is in motion has not been considered. While deriving the equation, it is assumed that there is no loss of energy when liquid is in motion. In fact, some KE is converted to heat energy. If a liquid is flowing along a curved path, energy due to centrifugal ...
