What causes ocean water around the equator to be warmer then the ocean water farther south of the equator

a. gyres in the northern hemisphere flow clockwise.
b. upwellings spew warm water toward the equator.
c. the sun heats earth and it’s oceans unevenly.
d. deep sea vents pump stream into oceans unevenly.

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?