(D) The lift force on an aeroplane wing is explained by Bernoulli's principle. Due to the shape of the wing (aerofoil),the air speed over the upper su

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Force due to the pressure difference between the upper and lower surfaces of the wings created by different air speeds on the surfaces

(D) The lift force on an aeroplane wing is explained by Bernoulli's principle. Due to the shape of the wing (aerofoil),the air speed over the upper surface is greater than the air speed over the lower surface. According to Bernoulli's theorem,where the speed of the fluid is higher,the pressure is lower. Thus,the pressure on the upper surface is lower than the pressure on the lower surface. This pressure difference creates an upward force called lift,which balances the weight of the aeroplane.

Class 11 Physics Fluid Mechanics and Surface Tension Bernoulli's Theorem and Applications of Bernoulli's Theory

Easy

The weight of an aeroplane flying in the air is balanced by:

A
Vertical component of the thrust created by air currents striking the lower surface of the wings
B
Force due to reaction of gases ejected by the revolving propeller
C
Upthrust of the air which will be equal to the weight of the air having the same volume as the plane
D
Force due to the pressure difference between the upper and lower surfaces of the wings created by different air speeds on the surfaces

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Fluid Mechanics and Surface Tension

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Bernoulli's Theorem and Applications of Bernoulli's Theory

$A$ steady flow of water passes along a horizontal tube from a wide section $X$ to the narrower section $Y$,see figure. Manometers are placed at $P$ and $Q$ at the sections. Which of the statements $A, B, C, D$ is most correct?

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State Bernoulli's principle in words.

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Water is pumped steadily out of a flooded basement at a speed of $10 \ m \ s^{-1}$ through a hose (tube) of radius $1 \ cm$, passing through a window $3 \ m$ above the water level. The power of the pump is (Assume $g = 10 \ m \ s^{-2}$, density of water $= 1000 \ kg \ m^{-3}$): (in $\pi \ W$)

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$A$ manometer connected to a closed tap reads $3.5 \times 10^5 \ N/m^2$. When the valve is opened,the reading of the manometer falls to $3.0 \times 10^5 \ N/m^2$. The velocity of the flow of water is ........ $m/s$.

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Water is flowing through a horizontal tube having cross-sectional areas of its two ends as $A$ and $A'$ such that the ratio $A/A'$ is $5$. If the pressure difference of water between the two ends is $3 \times 10^5 \, N \, m^{-2}$,the velocity of water with which it enters the tube will be ......... $m \, s^{-1}$ (neglect gravity effects).

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The weight of an aeroplane flying in the air is balanced by:

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$A$ steady flow of water passes along a horizontal tube from a wide section $X$ to the narrower section $Y$,see figure. Manometers are placed at $P$ and $Q$ at the sections. Which of the statements $A, B, C, D$ is most correct?

State Bernoulli's principle in words.

Water is pumped steadily out of a flooded basement at a speed of $10 \ m \ s^{-1}$ through a hose (tube) of radius $1 \ cm$, passing through a window $3 \ m$ above the water level. The power of the pump is (Assume $g = 10 \ m \ s^{-2}$, density of water $= 1000 \ kg \ m^{-3}$): (in $\pi \ W$)

$A$ manometer connected to a closed tap reads $3.5 \times 10^5 \ N/m^2$. When the valve is opened,the reading of the manometer falls to $3.0 \times 10^5 \ N/m^2$. The velocity of the flow of water is ........ $m/s$.

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