Abox weighing 43 n is pulled horizontally until it slides uniformly over a level floor. if the applied force is 5.5 n, what is the coefficient of friction between the box and the floor?

Explanation:

First, write the summatory of the forces. Note that on the x axis is also 0 because the problem states that the box is moving uniformly (no acceleration):

Now, you know that the force of friction can be writen as the normal force multiplied by the coefficient of friction:

From the y axis forces and the last expression:

Using this expression and the formula for the x axis:

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