A chair of mass 115kg is sitting on the horizontal floor, Ask an Expert

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A chair of mass 11.5kg is sitting on the horizontal floor; the floor is not frictionless. You push on the chair with a force F = 38.0N that is directed at an angle of 40.0^\circ below the horizontal and the chair slides along the floor. use Newton's laws to calculate the normal force that the floor exerts on the chair.

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