Physics

Problem

Air flows past a small wing of area

2.0\,\text{m}^2

. The speed of air over the upper surface is

60\,\text{m}\,\text{s}^{-1}

while that under the lower surface is

45\,\text{m}\,\text{s}^{-1}

. Take the density of air as

1.3\,\text{kg}\,\text{m}^{-3}

. Calculate the magnitude of the upward force acting on the wing.