An example of an atom that has no charge is one that has?

Gunpowder residue is most likely to show up where on a shooters hands

Aplayground merry-go-round has a radius of 4.6 m and a moment of inertia of 200 kg-m2 and turns with negligible friction about a vertical axle through its center. a child applies a 26.0 n force tangentially to the edge of the merry-go-round for 15.0 seconds. if the merry-go-round is initially at rest, how much work did the child do on the merry-go-round?

Scientific models are based on current knowledge, which can limit their effectiveness when new discoveries are made.