Answer in one or two sentences : (i) Explain how a needdle can pierce our skin very easily.
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3
Explanation:
this is because needle's tip has very less surface are so this will highly increase the pressure required to pierce our skin as pressure is inversely proportional to surface area.
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2
Answer:
As we know sharp needdle jas the greater force acting per unit area then then the blunt needdle.
it means that a sharp needle can pierce the sken easily as there is a greater pressure acting on to skin by needdle but in case of blunt needdle it won't happen...
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