Which of the following cars has a displacement North of its initial position? F A car travels South for 10 miles, turns around and returns to the starting position. G A car travels North for 10 miles, turns around and travels South for 16 miles. H A car travels North for 10 miles, turns around and returns to the starting position. J A car travels South for 10 miles, turns around and travels North for 16 miles.

Determine the maximum r-value of the polar equation r =3+3 cos 0

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.

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up