Question 1007674
1)  The centripetal force is calculated as
{{{F = m*v^2 / r}}} so that
F = 10*4^2 / 7 = 160 / 7 = 22.86 N
2)  Centripetal means "toward the center," and that is the direction the force is directed.
3)  The centrifugal "force" is the mythical force commonly believed to be involved here.