The Achilles tendon, which connects the calf muscles to the heel, is the thickes

Question

The Achilles tendon, which connects the calf muscles to the heel, is the thickest and strongest tendon in the body. In extreme activities, such as sprinting, it can be subjected to forces as high as 13.0 times a person's weight. According to one set of experiments, the average area of the Achilles tendon is 78.2 mm2 , its average length is 26 cm , and its average Young's modulus is 1474 MPa .

Part A: How much tensile stress is required to stretch this muscle by 5.2 % of its length: 7.7 x 10^7 SOLVED

Part B: If we model the tendon as a spring, what is its force constant? answer in units of N/m i got the answer of 139N/m and it is incorrect. i have one attempt remaining PLEASE help!

Part C: If a 75 kg sprinter exerts a force of 13.0 times his weight on his Achilles tendon, by how much will it stretch? Answer: 2.2cm SOLVED

Really need help with part B please! please include correct answer and procedure for thumbs up and appreciative comment.

Explanation / Answer

B)
we know, stress = F/A

==> F = stress*A

= 7.7*10^7*78.2*10^-6

= 6021.4 N

elongation, x = 5.2% of 26 cm

= 0.052*0.26 m

= 0.01352 m

now use Hook's law, F = k*x

==> k = F/x

= 6021.4/0.01352

= 4.45*10^5 N/m <<<<<<------------Answer

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