A girl weighting 90kg s standing on pencil heels , each having an area of cross - section of 1 cm2 . an elephant weighing 3000 kg and foot area of floor . which of the two exerts more pressure on the floor ? {given g = 10 m-2}
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Mass of girl=90kg
Area=1cm2=0.0001m2
Pressure due to girl= force/area
Force exerted due to girl=F=W=m×g
F=90×10=900N
Pressure due to girl=900/0.0001=9000000Pa
Force exerted due to elephant=200×10=2000N
Area=250cm2=0.025m2
Pressure=2000/0.025=80000Pa
Therefore force exerted by girl is more than elephant as the area of contact is less in heels than elephant....
Hope you find it easy.......
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