1. The problem statement, all variables and given/known data A hydraulic jack is used to lift a load of weight 1000N. The load-bearing cylinder has a radius of 4cm and the other piston has a radius of 1cm. What force must be exerted on the smaller piston to support the load? f2/f1 = A2/A1 My question is: I have this calculated already but why the A2 must be squared and be 16 whereas I don´t need to square f2? When do I have to square and what? I thought I was supposed to square F2 and A2. Now, check the following problem: One section of a pipe has a cross-sectional area of 20cm^2. In this section water has flow velocity of 1.0m/s. Another section of this pipe has a constricted cross-sectional area of 5cm^2. If flow is steady, what is the water velocity in the constricted section? A2v2 = v1a1 The A2 in this problem is not squared. Why? I thought A2 or V2 was supposed to be squared. Could anyone tell me exactly what is supposed to be squared when I am using any of these formulas?