Town X and town Y are 500 km apart. A car travels from town X at 50 km/h. At the same time a van starts to travel at 30 km/h from town Y. When and where do the car and van pass each other?

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=