12. To calculate the momentum of a pickup truck moving at 25 m/s east, it is also necessary to know which of the following?
a. Time elapsed
b. Drive force of the motor
C. Mass of the truck
d. Distance the truck travels

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.

How many times did thomas edison mess up the light bulb

What are the similarities & differences between a thermistor and a light dependent resistor in physics?