The kinetic theory is useful for a explaining how matter and energy are not always related. b testing the temperature of a gas. c determining how much heat is necessary to melt a solid. d showing the differences between states of matter.

showing the differences between states of matter.

D

Explanation:

the kinetic theory of matter states that matter is made up of molecules that are in continuous motion.this in turn talks about the different states of matter

the simple machine has three main features. they are:

fulcrum is the center point or pivot point of the machine. effort is input force/ applied force. load is external force/ output.

the keisha 's machine labels are

x : load

y: fulcrum

z: lever

uranium fissions/breaks up giving out energy and neutrons