A student releases the bob of a pendulum as shown. Neglect loss. Identify the energy types present at each time for the highlighted object or system
relative to the reference level shown. Also identify if loss occurs and/or work is done
by a non-conservative force between each time (if necessary).
reference level
b

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=