In earthquakes rated 7 or more where in the safest place to be

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?

Ascientist wants to test ways to reduce pollution in lake . what is the bestway of doing this

Where should a carbon monoxide detector be mounted?