What is the process by which heat transfers from one particle of matter to another when the particles collide?

Lets say that an object of a certain volume has a certin mass. what happens to its mass when you double its volume?

The long handle on a rake is a(n) a. lever b. screw c. wedge d. inclined plane

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.