When might a pendulum have equal kinetic and potential energy?

Why should seat belts not be mandatory quick plz

Which of the following is not a physical property of mattera. melting pointb. heat of combustionc. viscosityd. boiling point

Which statement is the best definition of an atom? a) anything that has mass and occupies space. b) the smallest particle that has the properties of an element. c) a substance that cannot be broken down chemically into simpler substances. eliminate d) the smallest unit of a substance that exhibits all of the properties characteristic of that substance.