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(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 2.60 cm?

(b) If a force of this magnitude is applied compressively, by how much does the 22.0 cm long bone shorten?

Y=F/A is what I tried for Part A but im not sure if I', using the right area. Without the first part I can't even attempt B.