You want to predict the frequency at which a spring ball system will oscillate. you measure the spring constant to be 179 \frac{n}{m} âm â ân ââ and use a ball of mass 1.48 kg. the frequency is

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.