6. which is a characteristic of chemical equilibrium but not physical equilibrium?
nds
eactions
a the reactants and products are different substances.
b the changes occur at the same rate.
reactions
c only chemical equilibrium occurs in a closed system.
od the reactants and products are the same substances.
40
est
5. acids and

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.

Give an example in which the electrical energy changes to light energy

The energy produced as a result of this flow of electrons from atom to atom is called