During a circus act, one performer swings upside down hanging from a trapeze holding another, also upside-down, performer by the legs. If the upward force on the lower performer is three times her weight, how much (in m) do the bones (the femurs) in her upper legs stretch? You may assume each is equivalent to a uniform rod 33.0 cm long and 1.90 cm in radius. Her mass is 57.5 kg.

A disk between vertebrae in the spine is subjected to a shearing force of520N. Find its shear deformation taking it to have the shear modulus of1.0010⁹N/m².The disk is equivalent to a solid cylinder0.700 cmhigh and4.30cmin diameter. m