The upper surface of wings of an aeroplane are made convex and lower concave downwards?

The speed of flow past the lower surface of a wing of an aeroplane is 50ms^(-1) . What speed of flow over the upper surface will give a dynamic lift of 1000 pa ? Density of air =1.3 kgm^(-3)

The wings of an aeroplane are rounded at the front and flattened at the back. Why ?

The snow accumulated on the wings of an aeroplane may decrease the lift " why ?

State whether true or false. Rewrite the false statements in their correct form : Transpiration is more from the upper surface of a leaf as compared to lower surface in a dorsiventral leaf.

A fully loaded Boeing aircraft has a mass of 3.3xx10^(5) kg . Its total wing area is 500 m^(2) . It is in level flight with a speed of 960 km//h . (a) Estimate the pressure difference between the lower and upper surfaces of the wings (b) Estimate the fractional increases in the speed of the air on the upper surfaces of the wing relative to the lower surface. The density of air is 1.2 kg//m^(3) .

The adjacent figure shows a thin plano-convex lens of refractive index mu_1 and a thin plano-concave lens of refractive index mu_2 , both having same radius of curvature R of their curved surfaces. The thin lens of refractive index mu_3 has radius of curvature R of both its surfaces. This lens is so placed in between the plano-convex and plano-concave lenses that the plane surfaces are parallel to each other. The focal length of the combination is

The speed of the wind passing over the wings of a small aeroplane is 70 m/s and below the wing is 60 m/s. If the mass of the plane is 1000 kg and the area of wing is 14 m^(2), then what will be ther net vertical force on the aeroplane ? ? (Density of air =1.2 kg//m^(3) and g=10 m//s^(2))

The pressure on the top surface of an aeroplane wing is 0.8xx 10^5 Pa and the pressure on the bottom surface is 0.75 xx 10^5 Pa. If the area of each surface is 50 m^2 , the dynamic lift on the wing is

Air is streaming past a horizontal airplane wing such that its speed is 90 ms^(-1) at the lower surface and 120 ms^(-1) over the upper surface. if the wing is 10 m long and has an average width of 2 m , the difference of pressure on the two sides and the gross lift on the wing respectively, are (density of air =1.3kgm^(-3) )

The convex surface of a thin concave-convex lens of glass of refractive index 1.5 has a radius of curvature 20 cm. The concave surface has a radius of curvature 60 cm. The convex side is silvered and placed on a horizontal surface as shown in figure. (a) Where should a pin be placed on the axis so that its image is formed at the same place ? (b) If the concave part is filled with water (mu = 4/3), find the distance through which the pin should be moved so that the image of the pin again coincides with the pin.