Your science teacher hands you a small container filled with an unknown liquid substance. he asks you to measure the mass of the liquid. what lab equipment will you use and how will you calculate the mass of just the liquid? be sure to describe the process you would follow step-by-step.

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=