Question

question 9 of 10
the hot, expanding gases generated by the combustion reaction in the engines are:
a. used to move the pistons, which help to propel the airplane.
b. used to move the wings.
c. used to provide lift for the airplane.
d. released through the back of the engine to propel it and the airplane forward.

Explanation:

In an airplane engine, combustion - generated hot expanding gases are expelled through the back of the engine. According to Newton's third law of motion, this creates a reaction force that propels the engine and the airplane forward. The movement of pistons is more relevant to piston - driven engines like in cars, not airplane jet engines. Wings' movement is not directly related to these gases, and lift for an airplane is mainly provided by the shape of the wings and air flow over them, not by engine combustion gases.

Answer:

D. released through the back of the engine to propel it and the airplane forward.