A car is seen by a pedestrian on a street corner to be moving down the road at 7 m/s. From the frame of reference of a person in the backseat, how fast does the pedestrian on the street corner appear to be moving?

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.

beta is electron from nucleus

something from nucleus has changed, but charge must be same for cons of charge