a stick of length f/2 is placed on principal axis of a concave mirror of focal length f such that the image of one end coincides. then the length of its image will 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?

The movement of electrons between atoms is called an

Notice how they put future which of the clouds shown would indicate a possible future rain storm? a) b) c) d)