Remove the ice cube tray and the plastic bag from the freezer and let them sit for 3 minutes. Then gently remove the piece of ice from the tray and the piece of ice from
the plastic bag. Place each piece of ice on a piece of foil. Check the pieces of ice
about every three minutes until you can clearly see whether there's a difference in
how fast they are melting. What do you
observe?

Four point charges each having charge q are located at the corners of a square having sides of length a. find symbolic expressions for the following. (a) the total electric potential at the center of the square due to the four charges (use any variable or symbol stated above along with the following as necessary: ke.) vtotal= (b) the work required to bring a fifth charge p from infinity to the center of the square (use any variable or symbol stated above along with the following as necessary: w=