Question

what is the relationship of lift, drag, thrust, and weight when the airplane is in straight and level flight? lift equals weight, thrust equals drag. lift equals weight and thrust equals drag. lift and weight equal thrust and drag. lift, drag, and weight equal thrust.

Explanation:

Step1: Analyze forces in straight - level flight

In straight - level flight, the airplane is in a state of equilibrium.

Step2: Balance of vertical forces

The vertical forces are lift (\(L\)) and weight (\(W\)). For vertical equilibrium, \(L = W\).

Step3: Balance of horizontal forces

The horizontal forces are thrust (\(T\)) and drag (\(D\)). For horizontal equilibrium, \(T=D\).

Answer:

Lift equals weight and thrust equals drag.