The steel oil container shown in the figure has a circular lid centred on its sloping wall. The lid is hinged at A and held closed with a frictionless stopper at B. The lid is made of 2.5cm thick stainless steel (ρ=8000kg/m³).
a. Draw a clear diagram showing all the forces acting on the lid;
b. Calculate the hydrostatic force on the lid;
c. Determine the location where the hydrostatic force acts; and
d. Calculate the force on the stopper.