A girl is wearing a pair of flat shoes . She weighs 550N . The area of contact of one shoe with the ground is 160cm² . What pressure will be exrted by the girl on the ground:
(i) If she stands on two feet?
(ii) If she stands on one foot?

Asked by Shawn | 11th Sep, 2015, 08:39: PM

Expert Answer:

The girl weighs is F = 550 N
The area of contact of one shoe with the ground is A =160 cm= 0.16 m2
begin mathsize 14px style Pressure equals Force over Area end style
(i) If the girl stands on two feet:
Therefore, Area, A=0.16 m= 0.16 m2 x 2 = 0.32 m2
begin mathsize 14px style Pressure equals Force over Area equals fraction numerator 550 space straight N over denominator 0.32 space straight m squared end fraction equals 1718.75 space straight N divided by straight m squared end style

(ii) If the girl stands on one foot:
begin mathsize 14px style Pressure equals Force over Area equals fraction numerator 550 space straight N over denominator 0.16 space straight m squared end fraction equals 3437.5 space straight N divided by straight m squared end style

Answered by Faiza Lambe | 12th Sep, 2015, 11:22: AM