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1) https://www.chegg.com/homework-help/questions-and-answers/water-inside-stainless-steel-spherical-vessel-1-m-inner-diameter-10-mm-wall-thickness-main-q36245422

2) https://www.chegg.com/homework-help/questions-and-answers/roof-store-room-made-2-outer-layers-plasterboard-kp-025-w-mk-middle-layer-fiberglass-insul-q46301815

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