A woman exerts a horizontal force of 135 N on a box with a mass of 39.2 kg.   (a) If the box doesn't move, what's the magnitude of the static friction force (in N)?     (b) What is the minimum possible value of the coefficient of static friction between the box and the floor? (Assume the box remains stationary.)

Question
A woman exerts a horizontal force of 135 N on a box with a mass of 39.2 kg.
 
(a)
If the box doesn't move, what's the magnitude of the static friction force (in N)?
 
 
(b)
What is the minimum possible value of the coefficient of static friction between the box and the floor? (Assume the box remains stationary.)
 

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