Assume that Youngs modulus is 1.50 - 1010 N/m2 for bone and that the bone will fracture

Question:

Assume that Young’s modulus is 1.50 - 1010 N/m2 for bone and that the bone will fracture if stress greater than 1.50 - 108 N/m2 is imposed on it.
(a) What is the maximum force that can be exerted on the femur bone in the leg if it has a minimum effective diameter of 2.50 cm?
(b) If this much force is applied compressively, by how much does the 25.0-cm-long bone shorten?