<p> AERODYNAMICS MIDTERM EXAM #1</p><p>Basic Properties of Physics</p><p>1) What is power?</p><p> a) Ability to do power b) Work done per unit of time c) Energy due to motion d) Mass times acceleration</p><p>2) Air density is:</p><p> a) Total mass of air particles per unit of volume b) Total mass of air particles at a given temperature c) The volume of air at a given temperature d) The volume of air particles</p><p>3) What is Newton’s Third Law?</p><p> a) A push or pull exerted on a body b) F = m x a c) For every action there is an equal and opposite reaction d) A body at rest tends to stay at rest; a body in motion tends to stay in motion unless acted upon by an outside force</p><p>4) What is the value of atmospheric pressure on a standard day?</p><p> a) 2116 lb/ft2 b) 29.92” Hg c) 32.17 ft/sec3 d) 2116 ft2/lb</p><p>5) On what property is speed of sound most dependent?</p><p> a) Pressure b) Density c) Temperature d) Weight</p><p>6) A student trims the airplane because:</p><p> a) If the airplane is trimmed it is in equilibrium flight b) If he doesn’t the instructor will yell at him c) Trimming reduces pressure on the control stick and rudder thus making the plane easier to fly d) Both b and c are correct</p><p>7) What is aerodynamic force (AF)?</p><p> a) A force vector which is always oriented parallel to relative wind b) A force vector which is a result of pressure and friction distributed over an airfoil c) A coefficient which depends solely on angle of attack and camber d) A force vector which is always oriented perpendicular to relative wind 8) What must a pilot due to maintain constant altitude and indicated airspeed as aircraft weight decreases due to fuel consumption? a) Maintain constant true airspeed and reduce angle of attack b) Increase true airspeed and reduce angle of attack c) Increase true airspeed and increase angle of attack d) Increase true airspeed and maintain constant angle of attack</p><p>9) Aerodynamic force is expressed in units of:</p><p> a) Slugs b) lbs/ft2 c) Ft - lbs d) Lbs</p><p>10) Maximum lift will be attained at what point?</p><p> a) L/D maximum AOA b) Minimum drag AOA c) CLMAS AOA d) Maximum velocity airspeed</p><p>11) In a constant altitude turn, what must the vertical component of lift be equal to?</p><p> a) Induced drag b) Horizontal lift component c) Weight d) Thrust</p><p>12) What is the effect of an increase in AOA, at a constant TAS, on the moment about the aerodynamic center (AC) of a positive cambered airfoil?</p><p> a) The pitching moment about the AC increases b) The pitching moment about the AC decrease c) The pitching moment about the AC remains constant but will vary if g, S, or camber are changed d) No pitching moment about the AC is provided</p><p>KEY 1) b 2) a 3) c 4) b 5) c 6) c 7) b 8) a 9) d 10) c 11) c 12) c</p>