A small box is held in place against a rough wall by
Chapter 4, Problem 56(choose chapter or problem)
A small box is held in place against a rough wall by someone pushing on it with a force directed upward at 28 above the horizontal. Ibe 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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