In a human pyramid in a circus

In a human pyramid in a circus, the entire weight of the balanced group is supported by the legs of a performer who is lying on his back (as shown in figure) the combined mass of all the persons performing the act and the tables, plagues etc. involved in 280 kg.
The mass of the performer lying on his back at bottom of the pyramid is 60 kg. Each thighbone (femur) of this performer has a length of 50 cm and an effective radius of 2.0 cm. Determine the amount by which each thighbone gets compressed under the extra load Young’s modulus for bone is 7 = 9.4x${{10}^{9}}$ N/${{m}^{2}}$.

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