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A solid concrete block weighs 150. N and is resting on the ground. Its dimensions are 0.400 m 0.200 m 0.100 m. A number of identical blocks are then stacked on top of this one. What is the smallest number of whole blocks (including the one on the ground) that can be stacked so that their weight creates a gauge pressure of at least two atmospheres on the ground beneath the first block?

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