The hydraulic accumulator in Figure 3 supplies a press. The ram (with its dead weights) and its total lift are marked on the figure. During a working stroke of the press the ram falls through its full lift in 2 min while the pump continues to deliver 5 L/s into the accumulator. Neglecting friction, determine (a) the capacity of the accumulator (answer in kJ) and (b) the power delivered to the press (answer in kW).