I am trying to determine the power requirements for an AC Motor for a Plunger type wave maker. Attached is the layout of the plunger and tank. The formulas that I think might be involved in solving this problem are below: P.E = mgh W= F x d Power= W/time Pressure= F/ area What I know(guesstimates to try help me understand the problem) : Volume of plunger =.125m3 => amount of water displaced by plunger = 125kgs of water Distance = 50cm = plunger moves from start position 50cm downwards. Time= 1 sec for plunger to move downward 50cm. 10000kg of water in the tank. Horizontal force of water in tank= 375kg force per unit area = 3678.75 N What I don't know: How is Force calculated in this situation Which of the above formula(if any) can be used in figuring this out Does it make a difference that the external force used to move the water is acting vertically rather than horizontally? Any idea anyone?