1. how does the resistance force relate to the effort force for the fixed pulley alone?
2. how does the mechanical advantage compare with the slope of the line for each pulley?
3. what do you think would happen to the mechanical advantage if you added a third movable pulley?
~no answer choices. you don't have to answer all of them just one will be okay.~

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.