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Conclusion will be that pressure is inversely proportional to area which means if if the books in the first it occupies more space for the books and sold the pressure will be less and in the second one the books are kept above only so they are occupied by less area and hence have more pressure and hence the strip or wooden whatever is there can break.
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Answer:The books on the first self doesn't bends it and in second the books on second self bends because of its pressure is not equally spread on it.
Explanation:When a weight is exerted on a solid, pressure is exerted on it. This pressure depends on the volume of the weight and the contact area between the two.
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