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Question
A hammer exerts a force of 1.5 N on each of the two nails A and B. The area of cross section of tip of nail A is 2 mm2 while that of nail B is 6 mm2. Calculate pressure on each nail in pascal.
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Solution
Force exerted , F = 1.5 N
Area of cross - section of tip of nail A , a1 = 2 mm2 = `2 xx 10^-6` m2
Area of cross - section of tip of nail B , a1 = 6 mm2 = `6 xx 10^-6 "m"^2`
Pressure on nail A = `"F"/"a"_1 = 1.5/(2 xx 10^-6) = 7.5 xx 10^5` pascal
Pressure on nail B = `"F"/"a"_2 = 1.5/(6 xx 10^-6) = 2.5 xx 10^5` pascal
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