posted by Mary .
A chair of weight 150 lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of = 38.0 directed at an angle of 41.0 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.
You posted this twice. I answered it elsewhere. You really must provide the units of force and weight along with the numbers. I assume they are in Newtons. You also should say "degrees" after 41.0