Problem: Design a Cantilever Beam subjected to a uniform distributed load w along its length L. The beam is made of steel with a yield strength of 250 MPa and must not deflect more than 10 mm at the free end. The material's Young's modulus is 200 GPa. Calculate the minimum required dimensions (depth d and width b) of the beam's rectangular cross-section to ensure both strength and deflection criteria are satisfied.