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The diameter of cylinder A in figure 3 is double that of cylinder B
figure on diameter of cylinder A
Determine the force F necessary to keep the system in equilibrium when a force F is applied as shown 

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F1 = F2   or F1A2 =F2A1
A1    A2
F1 × π (d/2)2 =10 × π × (2d/2)2
F1 × d2 =10d2
        4
F1 =40N

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