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Physics 26 Online
OpenStudy (anonymous):

A small box is held in place against a rough wall by someone pushing on it with a force directed upward at 28 degrees above the horizontal. The coefficients of static and kinetic frictions between the box and the wall are 0.50 and 0.30 respectively. The box slides down unless the applied force has a magnitude of 10 N. What is the mass of the box?

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