Two resistors, R1 and R2, are connected in parallel. R2 = 221.0
ohms, and the equivalent resistance
of the combination is 120.7 ohms.
What is the value of R1?
(Unit = ohm)

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.

The coefficient of friction is a number that represents the resistance to sliding between two in contact with one another.

The necleus of an atom is made up of what subatomic particles?