Show that for a free particle, a particle with momentum ~k (in a momentum eigenstate) is also an energy eigenstate, and compute its energy.

Why is there friction between objects

The consumption of fossil fuels could be

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.