An oil storage tank has one side sloping at 60° to the horizontal. a circular opening of diameter 300mm is cut into the side of the tank, and is covered by a plate bolted into place. the level of oil in the tank is 1.2m above the top of the opening. find: (a) the force acting on the plate (b) the depth of the centre if pressure for the plate below the surface of the oil

Asolid cylinder is concentric with a straight pipe. the cylinder is 0.5 m long and has an outside diameter of 8 cm. the pipe has an inside diameter of 8.5 cm. the annulus between the cylinder ad the pipe contains stationary oil. the oil has a specific gravity of 0.92 and a kinematic viscosity of 5.57 x 10-4 m2/s. most nearly, what is the force needed to move the cylinder along the pipe at a constant velocity of 1 m/s?