Asmall block with mass 0.0400 kg is moving in the xy-plane. the net force on the block is described by the potential-energy function u(x, y) = (5.80 j/m2 ) x2 − (3.60 j/m3 ) y3 . what are the magnitude and direction of the acceleration of the block when it is at the point (x=0.300 m, y=0.600 m)? draw the acceleration vector with components, and make a sketch of the potential energy vs. x and y

How would you place two electrons on a sphere of radius r so that the electrostatic potential energy is minimized. how would you place three electrons to solve the same problem.

Give an example in which the electrical energy changes to light energy

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.