Physics

Problem

A glider wing of area

5\,\text{m}^2

must generate a lift of

3.0\,\text{kN}

. Air of density

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

moves under the wing at

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

. What minimum speed should the airflow over the upper surface reach to achieve the required lift? a)

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

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

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

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