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A chair of weight 85.0 N lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of F = 36.0 N directed at an...

A chair of weight 85.0 N lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of F = 36.0 N directed at an angle of 39.0 degrees below the horizontal and the chair slides along the floor. Using Newton's laws, calculate , the magnitude of the normal force that the floor exerts on the chair.

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