Which theory of language development and acquisition includes the concepts of reinforcement, stimuli control, deprivation, and aversive stimulation? a. skinner’s idea of language b. jean piaget’s theory of cognitive development c. chomsky’s nativist approach d. bruner’s theory of language development

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.