Given this graph plotting velocity versus time, estimate the acceleration of object A at points X and Y respectively. A. 0 meters/second2 and -1 meter/second2
B. 0 meters/second2 and +1 meter/second2
C. 5 meters/second2 and -2 meters/second2
D. 9 meters/second2 and -1 meter/second2
E. 0 meters/second2 and +3 meters/second2

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 goes through a maximum, and then decreases. consider an infinite wing with an naca 2412 airfoil. estimate the maximum value of l/d. assume that the reynolds number is 9x10^6.

The air that we breath is made mostly of which gaseous molecule

The least penetrating form of radiation is