Line of Action
Horizontal direction: line of action goes through z’
Vertical direction: the line of action is 3R/8
away from the center of the hemisphere
location of the centroid for a hemisphere
is 3R/8=0.1875(m) away from the equator plane
The resultant moment of both forces with respect to the center of the hemisphere should be zero:
=15386(0.03125)-2564(0.1875)=0