JEE Main2013PhysicsMechanical Properties of FluidsActual
Air of density 1.2 ~kg ~m ⁻³ is blowing across the horizontal wings of an aeroplane in such a way that its speeds above and below the wings are 150 ~ms ⁻¹ and 100 ~ms ⁻¹ , respectively. The pressure difference between the upper and lower sides of the wings, is :
Options
- A60 Nm ⁻²
- B180 Nm ⁻²
- C7500 Nm ⁻²
- D12500 Nm ⁻²
Correct answer
C. 7500 Nm ⁻²
Step-by-step solution
Pressure difference aligned & P ₂- P ₁= 1 2 ( v ₂^2- v ₁^2 ) & = 1 2 1.2 ((150)^2-(100)^2 ) & = 1 2 1.2(22500-10000) & =7500 Nm ⁻² aligned