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**1. The problem statement, all variables and given/known data**

While moving in, a new homeowner is pushing a box across the floor at a constant velocity. The coefficient of kinetic friction between the box and the floor is 0.41. The pushing force is directed downward and an angle θ below the horizontal. When θ is greater than a certain value, it is not possible to move the box, no matter how large the pushing force is. Find the that value of θ.

**2. Relevant equations**

F = ma, f

_{k}= μ

_{k}F

_{n}

**3. The attempt at a solution**

I have tried working this problem multiple times, I must be missing something in the initial set up. I keep ending up with variables that don't cancel out, or I have given values for. (The only value given is for the coefficient for

kinetic friction). The solution given is just an angle in degrees.

I could really use a walk through of the solution to this problem. I'm missing some concept in my initial setup, and I just can't seem to see it.

Thanks in advance.

Rich.