Why does the pattern of colors repeat in a thin soap film? Please use 2 content related sentences. (ref: p.522-530)

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.

Which of the following is an example of motion in two dimensions?

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.