You weight is result of the gravitational force of earth on your body what is the cor responding reaction force

What do you think car designers do if the damage caused by a crash test is too severe?

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.

If forces acting on an object are unbalanced. true or false