State Newton’s second law of motion.
A model of an aircraft wing is being tested in a wind tunnel. The model is fixed in position by a support, and air is blown horizontally towards it. In one second, 18 kg of air moving at 80 m s-1 hits the model. After flowing around the model, the airflow is diverted downwards at an angle of 30∘ 30^\circ\,30∘ to the horizontal. The speed of the diverted airflow remains 80 m s-1.
Calculate the horizontal and vertical components of the velocity of the diverted airflow.
horizontal component of velocity = ______ m s−1\text{m s}^{-1}m s−1, vertical component of velocity = ______ m s−1\text{m s}^{-1}m s−1.
Explain how the airflow around the model produces a force on the model.
Calculate the vertical lift force F F\,F acting on the model due to the airflow around it.
F=F =F= ______ N\text{N}N