What is the unit and tool to measure the volume of a plastic block?

Why is alchemy not considered to be a science ?

How do you tell if someone actually cares about you? and just say they do?

Along the line connecting the two charges, at what distance from the charge q1 is the total electric field from the two charges zero? express your answer in terms of some or all of the variables s, q1, q2 and k =14ï€ïµ0. if your answer is difficult to enter, consider simplifying it, as it can be made relatively simple with some work.