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The weight of an aeroplane flying in the...

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

Text Solution

Verified by Experts

The correct Answer is:
D
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An aeroplane flies in the air.

The angle of the elevation of an aeroplane from a point on the ground is 45^(@) . After flying for 15 seconds, the elevation changes to 30^(@) . If the aeroplane is flying at a height of 2500 metres. Find the speed of the aeroplane.

Knowledge Check

  • The weight of an aeroplane flying in air is balanced by

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

  • The weight of an empty balloon on a spring balance is W_(1) . The weight becomes W_2 when the balloon is filled with air. Let the weight of air itself be W. Neglect the thickness of balloon when it is filled with air. Also neglect the difference the density of air inside and outside the balloon.

    A
    `W_(2) lt W_(1) + W`
    B
    `W_(2) = W_(1) + W`
    C
    `W_(2) gt W_(1)+W`
    D
    `W_(2) lt W_(1)`

  • The weight of an empty balloon on a spring balance is w_(1) . The weight becomes w_(2) when the balloon is filled with air . Let the weight of air itself be w. Neglect the thickness of balloon when it is filled with air. Also neglect the difference between the density of air inside and outside the balloon

    A
    `w_(2)ltw_(1)+w`
    B
    `w_(2)=w_(1)+w`
    C
    `w_(2)gtw_(1)+w`
    D
    `w_(2)ltw_(1)`

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