A 60 kg woman walking through an alley accidentally broke the heel of her left high-heeled. shoes. Now the woman tries to balance on one heel of a pair of high-heeled shoes. If the heel is circular and has a radius of 0.500 cm
p=FS=mgπr2=7.5 MPa.p=\frac FS=\frac{mg}{\pi r^2}=7 .5~MPa.p=SF=πr2mg=7.5 MPa.
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