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.

i think it because equal matrices have equal dimensions, only square matrices can be symmetric. for all indices and . every square diagonal matrix is symmetric, since all off-diagonal elements are zero. in linear algebra, a real symmetric matrix represents a self-adjoint operator over a real inner product space.

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.