What was world war 2 about?

Which of these describe conduction transfer of heat between two objects that are touching transfer of heat by the actual movement of war matter the process in which energy is imitated by one of the object transmitted through space and absorbed by another a process in which energy is released by the molecules breaking apart

Often called simply "velocity," this is the velocity of an object at a particular moment in time.

How is the ideal mechanical advantage of a wheel and axle calculated?