What is the difference between free fall and weightlessness

How can you increase the strength of an electromagnet?

Which of the following are used in an electrochemical cell? a. electrodes b. electrolyte c. terminals d. all of the above

During cooling, the kinetic energy of the molecules falls. why does this happen? a.the motion of the molecules increases. b. the motion of the molecules slows down. c.the van der waals forces between molecules decrease d. the forces of attraction between the molecules are overcome.