Car A is traveling at a constant speed of 20mph and hits Car B that is at rest. If car A comes to a complete stop when it hits car B what happens to car B that is at rest?

What type of electromagnetic wave is used in security pens? a. x-rays c. microwaves b. visible light d. ultraviolet radiation select the best answer from the choices provided

What is the mass of the same rock on the earth

If an atom contains 11 protons in its nucleus, predict the element with the atomic number and electronic configuration. will the number of electrons remain the same during the chemical reaction in such an atom? explain.