Please I'm a bit confused.

What is the angular momentum of the bar about the axle?

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.

Explain how a step-down transformer makes electricity safe for use in homes