Two metal spheres have a center to center separation of d=2m. sphere 1 has radius r1=.03m and charge q1=+1*x10^-8 c. sphere 2 has radius r2=2xr1 and charge q2=-3*x10^-8 c. assume the charge on each sphere is uniformly distributed. with v=0 at infinity, calculate the potential on the surfaces of sphere 1 and sphere 2.

On a horizontal frictionless surface, a small block with mass 0.200 kg has a collision with a block of mass 0.400 kg. immediately after the collision, the 0.200 kg block is moving at 12.0 m/s in the direction 30° north of east and the 0.400 kg block is moving at 11.2 m/s in the direction 53.1° south of east. use coordinates where the +x-axis is east and the +y-axis is north.(a) what is the total kinetic energy of the two blocks after the collision (in ) what is the x-component of the total momentum of the two blocks after the collision? (indicate the direction with the sign of your ) what is the y-component of the total momentum of the two blocks after the collision? (indicate the direction with the sign of your answer.)