An airplane is traveling at a cruising speed of 217 m/s. If the airplane’s engines provide a forward force of 19,530 N, calculate the force of the air resistance (friction) that is acting on the plane.

F = 19530 [N]

Explanation:

In order to solve this problem we must make a free body diagram and observe the forces acting on the plane.

The cruising speed is taken as a constant speed, i.e. there is no acceleration. Therefore, a zero-equal sum of forces on the X-axis can be performed in order to find the air resistance force.

In the attached schema we can see the free body diagram of these forces.

We can say that the moment the cruising velocity develops, the air resistance force is equal to the force developed by the turbines of the plane.

the answer is a)

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