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Question
A boy weighing 60 kgf stands on platform of dimensions 2.5 cm x 0.5 cm. What pressure in pascal does he exert?
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Solution
Force = Thrust = Weight = 60 kgf
= 60 x 10 = 600 N
Area of platform = 2.5 cm x 0.5 cm
`=2.5/100m xx0.5/100 m = 25/1000xx5/1000`
=`1/40xx1/200=1/8000m^2`
Pressure P = `F/ A = ( 600N)/((1m^2)/8000)`
`= (600 xx 8000)/1` =
= 4800000
=`4800000/10xx10`
= 4.8 × 106 Pa
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