An airfoil has a mean camber line that has the shape of a circular arc (constant tadius of curvature). The maximum mean camber is ke, where k is a constant and c is the chord. The free-stream velocity is Vo, and the angle of attack is a. Under the assumptiorn that k 《 1, γ distribution is approximately 1 + cos θ 1) Find the angle of zero lift (OL=0) 2) Find the moment coefficient about the leading edge. Cm. te 2) Find the moment coefficient about the aerodynamic center. Cm, ac) (i f n = 1) (ifn关1) 0 0

Calculate the ratio of h+ ions to oh– ions at a ph = 6. find the concentration of h+ ions to oh– ions listed in table b of your student guide. then divide the h+ concentration by the oh– concentration. record this calculated ratio in table a of your student guide. compare your approximated and calculated ratios of h+ ions to oh– ions at a ph = 6. are they the same? why or why not? record your explanation in table a. what is the concentration of h+ ions at a ph = 6? mol/l what is the concentration of oh– ions at a ph = 6? mol/l what is the ratio of h+ ions to oh– ions at a ph = 6? : 1

Engineers find a new metal that is stronger than steel but much lighter. this material is also significantly cheaper than what is currently used for most aircraft, available in large quantities, and easy to manufacture. the engineers are excited because this new material will lower the costs of buying and operating airplanes for companies. what is probably the best step for the engineers to make next?

Emagnitude of the electrical force acting between a +2.4 ×  10–8  c charge and a +1.8 ×  10–6  c charge that are separated by 0.008 m is    n, rounded to the tenths place.