r 9 h 3 Win joulesSolution The center of gravity of the lo

r = 9 h = 3

W=??(in joules)

The center of gravity of the lower half sphere is 3/8 r below the center of the sphere = 3.375 m below the center of the sphere. From there it is 3.375+9+3 m to the opening. The volume of the half sphere is 2/3*pi*r^3 = 2/3*3.14*9^3 = 1526.04 m^3. The mass is 1526.04*900 = 1373436 kg. The work is W = mgh = 1373436*9.8*15.375 = 206.94 MJ