In a chemical reaction, the total mass of the reactants is 10.0 grams. After the reaction, the total mass of the products must be what?

Asimply means that over time there was some sort of change.

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.

Which accounts for an increase in the temperature of a gas that is kept a constant volume