Air is streaming past a horizontal air plane wing such that its speed is $120{\rm{m}}{{\rm{s}}^{ - 1}}$ over the upper surface and $90{\rm{m}}{{\rm{s}}^{ - 1}}$ at the lower surface. If the density of air is $1.3{\rm{kg}}{{\rm{m}}^{ - 3}}$, what will be the gross life on the wing? If the wing is $10{\rm{m}}$ long and has an average width of 2 m,

JEE PHYSICS MCQ: MECHANICAL PROPERTIES OF FLUIDS

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Air is streaming past a horizontal air plane wing such that its speed is

120\mathrm{m}{\mathrm{s}^{ - 1}}

over the upper surface and

90\mathrm{m}{\mathrm{s}^{ - 1}}

at the lower surface. If the density of air is

1.3\mathrm{kg}{\mathrm{m}^{ - 3}}

, what will be the gross life on the wing? If the wing is

10\mathrm{m}

long and has an average width of 2 m,

View answer and explanation

Correct option: C

81.9 kN

Option C (81.9 kN) is correct because it is the gross lift calculated using Bernoulli's principle and the given air speeds, density, and wing dimensions.

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