Me with the formular of this question and the solvings.

Explanation:

Net Force

The second Newton's law explains how to understand the dynamics of a system where several forces are acting. The forces are vectorial magnitudes which means the x and y coordinates must be treated separately. For each component, the net force must equal the mass by the acceleration, i.e.

The box with mass m=20 kg is pulled by a rope with a angle above the horizontal. It means that force (called T) has two components:

We'll assume the positive directions are to the right and upwards and that the box is being pulled to the right. There are two forces in the x-axis: The x-component of T (to the right) and the friction force (to the left). So the equilibrium equation for x is

There are three forces acting in the y-axis: The component of T (upwards), the weight (downwards), and the Normal (upwards). Since there is no movement in the y-axis, the net force is zero and:

Rearranging:

Solving for N in the y-axis:

The friction force is given by

Replacing in the equation for the x-axis, we have

Replacing the formula for N in the equation for the x-axis  

Operating and rearranging

Solving for T:

Plugging in the given values:

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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