How did the distance from the sun affect the creation of planets?

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?

What is an electric motor? explain its operation. 2-3 sentence

Preciso de ajuda na parte de termometria e tenho prova amanhã ajuda ae prf