Home
Class 11
PHYSICS
Air is streaming past a horizontal airpl...

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)`)

A

Pressure difference between the bottom and top of he wing is 4090 Pa

B

Up - lift on the wing is 81900 N

C

Up - lift on the wing is 113.58 k N

D

Pressure difference between the bottom and top of wing is 3780 Pa

Text Solution

Verified by Experts

The correct Answer is:
C, D
Promotional Banner

Similar Questions

Explore conceptually related problems

Water is flowing in a river at 2 ms^(-1) . The river is 50 m wide and has an average depth of 5 m . The power available from the current in the river is (Density of water = 1000 kg m^(3)

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) .

Air stream flows horizontally past an aeroplane wing of surface area 4 m^(2) . The speed of air over the top surface is 60 ms^(-1) and under the bottom surface is 40 ms^(-1) The force of lift on the wing is (density of air = 1 kgm^(-3) )

Find the difference of air pressure (in N-m^(-2) ) between the inside and outside of a soap bubble 5 mm in diameter, if the surface tension is 1.6 N-m^(-1) :-

In a test experiment on a model aeroplane in a wind tunnel, the flow speeds on the upper and lower surfaces of the wing are 70ms^(-1) and 83ms^(-1) respectively. What is the lift on the wing, if its area is 2.5m^(2) ? Take the density of air to be 1.3kgm^(-3)

In a test experiment on a model aeroplane in a wind tunnel, the flow speeds on the upper and lower surfaces of the wing are 70 ms^(-1) and 63 ms^(-1) respectively. What is the lift on the wing if its area is 2.5 m^(2) ? Take the density of air to be 1.3 kg m^(-3)

A plane is in level flight at constant speed and each of its two wings has an area of 25 m^(2) . If the speed of the air on the upper and lower surfaces of the wing are 270 km h^(-1) and '234 km h^(-1)' respectively, then the mass of the plane is (Take the density of the air =1 kg m^(-3) )

Air streams horizontally past an air plane. The speed over the top surface is 60 m/s, and that under the bottom surface is 45 m/s. The density of air is 1.293 kg/ m^(3) , then the difference in pressure

Air flows horizontally with a speed v = 108 km/hr . A house has a plane roof of area A = 20 m^(2) . Find the magnitude of aerodynamic lift on the roof . [ Density of air = 1.3 kg//m^(3) ]

Two trains are each 50 m long moving parallel towards each other at speeds 10 ms^(-1) and 15 ms^(-1) respectively, at what time will they pass each other ?