How much heat is required to solidify 2.0 kg of liquid copper?

Find the momentum for a 2.6-kg brick parachuting straight downward at a constant speed of 8.4 m/s .

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 would a small bar magnet be oriented when placed at position x?