4.1) Explain why an aerospace engineer uses the velocity vector V. instead of the equal and opposite flight velocity vector when studying air flow around an aircraft. 4.2) List the four variables which define an ideal friction free (Newtonian) fluid velocity flow field and provide the names and expressions of the four equations used to solve them. 4.3) A jet engine is flying through standard sea level air at V = 140 m/s. Its intake captures air at the unddod at a rate of 2.2%