Which of the following statements about convection is true? a convection can only occur during the process of boiling b convection always involves the circulation of a liquid or gas c all types of currents are convection currents d convection occurs between solids only at high temperatures

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?