JEE PHYSICS MCQ: MECHANICAL PROPERTIES OF FLUIDS

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Application +4 | -1

A fully loaded Boeing aircraft 747 has a mass of

33 \times 10^5 \mathrm{~kg}

. Its total wing area is

500 \mathrm{~m}^2

. It is in level flight with a speed of

960 \mathrm{~km} / \mathrm{h}

. (a) Estimate the pressure difference between the lower and upper surfaces of the wings. (b) Estimate the fractional increase in the speed of the air on the upper surface of the wing relative to the lower surface. The density of air is

\rho=1.2 \mathrm{~kg} \mathrm{~m}^{-3}

and

g=9.81 \mathrm{~ms}^{-2}

View answer and explanation

Correct option: A

6.5 \times 10^3 \mathrm{~Nm}^{-2}; 8 \%

Option D (

1.95 \mathrm{~V}

) is correct because it is the potential difference calculated using Ohm's law, considering the internal resistance of the cell.

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