Compare the kinetic and potential energies of a 400 kg box being moved horizontally by a forklift at a speed of 5 m/s. The box is at a height of 1 m.

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.

Acamcorder has a power rating of 20 watts. if the output voltage from its battery is 9 volts, what current does it use?

Using the free-body diagram, calculate the net force acting on the sled. is the sled in a state of dynamic equilibrium?