Physics

Problem

A small model wing has an upper‐surface air speed of

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

and a lower‐surface speed of

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

. If the wing area is

2.0\,\text{m}^2

and air density is

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

, the magnitude of the lift force on the wing is closest to a)

4.9\,\text{kN}

0.55\,\text{kN}

1.1\,\text{kN}

2.2\,\text{kN}