The empty weight mass fraction is the ratio of the empty weight (WEmpty) to Takeoff gross weight (WTO)
It is the maximum length of time that an aircraft can spend in cruising flights and it is the amount of time an aircraft can stay in the air with…
Acting between any two objects is inversely proportional to the square of the separation distance between the object's centers
Drag Coefficient is a dimensionless quantity that is used to quantify the drag or resistance of an object in a fluid environment. CD = 2CDo
The drag coefficient is a number that depends on the shape, inclination and some flow conditions on lift. It is a unitless quantity.