What is the purpose of zigzag line on a periodic table ?

Which of the following is not am example of a polymer? protein nylon kevlar concreta

If the ama of the inclined plane below is 2, calculate the ima and efficiency. ima = efficiency =

What would be the result of an alpha particle coming into a magnetic field? a) the alpha particle will stop moving. b) the alpha particle will reverse its direction. c) the alpha particle will be deflected in a curve path. d) the alpha particle will continue to travel in a straight line.