Question

Example 10.1 The two thigh bones (femurs), each of cross-sectional area 10 cm? support the upper part of a human body of mass 40 kg. Estimate the average pressure sustained by the femurs.​

Answer 1

Answer:

Given, mass of body, m=40kg;g=10ms

−2

;

area, A=2× area of each thigh bone

=2×10cm

2

=20×10

−4

m

2

(weight of the body is supported by two thigh bones)

Force, F= weight of the body =mg=40×10

=400N

Pressure, P=

Area

Force

=

A

F

=

20×10

−4

400

=2×10

5

Pa