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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?

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# Homework Help: What should be squared?

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