Abox of mass 22 kg is at rest on a flat floor. the coefficient of static friction between the box and floor is 0.37. what is the minimum force needed to set the box in motion across the floor?

Point charges q1=+2.00μc and q2=−2.00μc are placed at adjacent corners of a square for which the length of each side is 1.50 cm . point a is at the center of the square, and point b is at the empty corner closest to q2. take the electric potential to be zero at a distance far from both charges. part a what is the electric potential at point a due to q1 and q2? express your answer with the appropriate units.