4.
Give reason for the following:
a) A person lying on a bed of nails is not hurt but when you step on a nail
start bleeding
you
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A person lying on a bed of nails IS hurt
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Answer:It appears to the spectator that anyone lying on this "bed" would be injured by the nails, but this is not so. Assuming the nails are numerous enough, the weight is distributed among them so that the pressure exerted by each nail is not enough to puncture the person's skin.
Explanation:
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