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Q. Assume that Young's modulus for bone is 8.66 × 10^9 N/m2 and that the bone will fracture if a shear stress more than 2.31 × 10^8 N/m2 is exerted.

What is the maximum force that can be exerted on the femur bone in the leg if it has a minimum effective diameter of 3.4 cm? Answer in units of kN.

Q. A broad beam of light of wavelength 485 nm is incident at 90° on a thin, wedge-shaped film with index of refraction 1.50. An observer intercepting the light transmitted by the film sees 17 bright and 16 dark fringes along the length of the film. By how much does the film thickness change over this length?

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