Answer:
(a) 1408366
(b) 448524
Step-by-step explanation:
Pressure on a vertical surface by a static non-viscous fluid is =Pressure at center of mass of the surface *Area of surface covered by fluid.
A) acceleration due to gravity =9.8*3.38
Radius =6
So pressure at center of circular plate =density*g*R
Total force =density*g*R*Area = 1408366
B) Here center of mass of semicircle sector is at from center.
So pressure at center of mass of semicircle =*density*9.8*3.38
Net force =*density*9.8*3.38*Area of semicircle =448524