A small box is held in place against a rough vertical wall
Chapter 4, Problem 48(choose chapter or problem)
A small box is held in place against a rough vertical wall by someone pushing on it with a force directed upward at 28 above the horizontal. The coefficients of static and kinetic friction between the box and wall are 0.40 and 0.30, respectively. The box slides down unless the applied force has magnitude 23 N. What is the mass of the box?
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