10.5 A 50 kg girl wearing high heel shoes balances on a single heel. The heel is circular with a diameter 1.0 cm. What is the pressure exerted by the heel on the horizontal floor?

Given,
m=50 kg
d=1 cm=0.01 m
r=d2=0.012=0.005 m
Now,
Area of heel, A=πr2=227×0.0052
=7.85×10-5 m2
Force exerted by the heel on the floor, F-=mg
=50×9.8=490 N
Hence, pressure, P=FA
=4907.85×10-5=6.24×106 N m-2