why is it difficult to have a School Bag having a strap made of a thin and strong string
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Explanation:
heya..........
It is difficult to hold a school bag having a strap made of a thin and strong string because the area under the strap is small. Hence large pressure is exerted by the strap on the fingers or shoulders. Due to the large pressure, the strap tends to cut the skin and hence pain is caused.
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Answer:
As we know pressure is inversely proportional to Area . so as area decreases the pressure acting per unit area increases. so to reduce pressure on shoulders the school bags have straps made up of thick string rather than thin.
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