JEE Main 201322 AprilOnline
- Exam
- JEE Main
- Year
- 2013
- Date
- 22 April
- Mode
- Online
- Subject
- Physics
- Chapter
- Mechanical Properties of Fluids
JEE Main 2013 · 22 April · Online · Physics · Mechanical Properties of Fluids
Air of density 1.2 ~kg ~m^ -3 is blowing across the horizontal...
Air of density is blowing across the horizontal wings of an aeroplane in such a way that its speeds above and below the wings are and , respectively. The pressure difference between the upper and lower sides of the wings, is :
Options
- A
- B
- C
- D
Correct answer
C.
Step-by-step solution
Pressure difference\begin{aligned}& \mathrm{P}}_{2}- \mathrm{P}}_{1}=\frac{1}{2} \rho\left(\mathrm{v}}_{2}^2- \mathrm{v}}_{1}^2\right) \\
& =\frac{1}{2} \times1.2\left((150)^2-(100)^2\right) \\
& =\frac{1}{2} \times1.2(22500-10000) \\
& =7500 \mathrm{Nm}^{-2}
\end{aligned}