question_answer

Air of density 1.2 \[\operatorname{Kg}{{\operatorname{m}}^{-3}}\] is blowing across the horizontal wings of on aero plane in such a way that its speeds above and below the wings are \[150\,\,m{{s}^{-1}}\] and \[100\,\,m{{s}^{-1}}\], respectively. The pressure difference between the upper and lower                              [JEE ONLINE 22-04-2013]

A)        \[60\operatorname{N}{{\operatorname{m}}^{-2}}\]      

B)       \[180\operatorname{N}{{\operatorname{m}}^{-2}}\]

C) \[7500\operatorname{N}{{\operatorname{m}}^{-2}}\]

D)                   \[12500\operatorname{N}{{\operatorname{m}}^{-2}}\]

Correct Answer: C

Solution :

Pressure difference