A weight lifter lifts a 150 Kg barbell above his head from the floor to a height of 2m. He holds the barbell for 5 seconds. How much work does he do during that 5 second interval

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=