Three cylinders are piled in a rectangular ditch as shown. The radius of the uppermost cylinder is 7 cm., the middle one is 9 cm., and the bottom cylinder is 4 cm. The ditch has a length of L = 21 cm. Assume that the weight of the cylinders are W1 = 22 kN, W2 = 40 kN, and W3 = 18 kN. Determine the reaction (kN) at A. Neglect friction

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