A box (mass m) rests on a horizontal floor. Jdff would like to move it with a string at an angle θ to horizontal (see th

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A box (mass m) rests on a horizontal floor. Jdff would like tomove it with a string at an angle θ to horizontal (see the figurebelow ). Assuming the string’s mass is negligible and the box movesonly along the horizontal floor surface, the static frictioncoefficient between the box and the floor is us(=0.4) (a) WhenJeff’s pulling force is just about to move the box, what would bethe pulling force? (b) Based on the result in (a), find the angle θsuch that the pulling force would be the least to move the box.