# If the speed of flow past the

If the speed of flow past the lower surface of an airplane wingis 110 m/s, what is the speed of flow over the upper surface withgive a pressure difference of 900 Pa between upper and lowersurfaces? Density of air 1.21 kg/ m3

the speed of flow past the lower surface of an airplane wing isv = 110 m/sthe speed of flow over the upper surface v’ = ?pressure difference between upper and lower surfaces dP = 900Pathe density of air ? = 1.21*10-3 g/cm3.

= 1.21* 10-3 *10-3 kg / 10-6m3

= 1.21 kg / m3

from Bernoulli’s equation, dP = ( 1/ 2) ? [ v’2-v2]

900 = 0.605 [ v’2-1102]

=0.605 v’2 – 7320.5

v’ = 116.57m/s

the speed of flow over the upper surface is 116.57 m/s

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