1. Most hand pumps used in wells rely on
(5 Points)
O a. Boyle's law
O b. suction
O c. atmospheric pressure
O d. Archimedes' principle

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.