Solved: A small box is held in place against a rough wall
Chapter 19, Problem 56P(choose chapter or problem)
(II) A small box is held in place against a rough wall by someone pushing on it with a force directed upward at \(28^{\circ}\) 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 13 N. What is the mass of the box?
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