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2015-10-30T18:30:00+05:30

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Since , P = F/A ,

Since , P is inversely proportional to A , since , a blunt knife accquires less pressure due to large area on vegetable so thats why it is difficult A increases so P decreases ,
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2015-10-31T09:49:01+05:30

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We know that ,

P= \frac{F}{A}

 Pressure is inversely proportional to force and area . So ,when pressure  increases the Force and Area Decreases. 

Similarly , as in the  case of blunt knife the Force and Area is increased , so the pressure decreases. That's why it is difficult to cut the vegetables with blunt knife with less amount of pressure.

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okay.. i'll mark :P
:P try it ... ^_^
:P umm.. yeah... :P