The ratio of lift to drag l/d for a wing or airfoil is an important aerodynamic parameter; indeed, it is a direct measure of the aerodynamic efficiency of the wing. if a wing is pitched through a range of angle of attack, l/d first increases then go through a maximum and then decreases. consider an infinite wing with a naca 2412 airfoil. estimate the maximum value of l/d. assume that the reynolds number is 9 × 106.

Three archers each fire four arrows at a target. joe’s four arrows hit at points 10 cm above, 10 cm below, 10 cm to the left, and 10 cm to the right of the center of the target. all four of moe’s arrows hit within 1 cm of a point 20 cm from the center, and flo’s four arrows hit within 1 cm of the center. the contest judge says that one of the archers is precise but not accurate, another archer is accurate but not precise, and the third archer is both accurate and precise. which description applies to which archer? explain

Acompound machine is also called a machine. a. force b. simple c. complex d. directional

Mga halaman/punong ornamental na di namumulaklak