Question

Consider a human femur of length L = 444 mm. Model the bone as a hollow cylinder, with inner radius R_a = 5.58 mm and outer radius R_b = 16.74 mm. If a 83 kg person's weight is supported by one leg, calculate the stress on the femur; express as percentage of the ultimate compressive strength (UCS). Ignore the weight of the leg.

Correct, computer gets: 0.64

Hint: To express as a percentage of the UCS multiply by 100/UCS. Do not enter any units as they will cancel out.

7. [1pt]
Assuming that the bone follows Hooke's law up to the breaking point, calculate the amount of compression, ΔL (in mm, don't enter unit), that this bone can withstand before breaking.

Answer 1