Question4. a)What is lever rule used for? You can also show by drawing binary phase diagram b)Derive this equation using conservation of mass and sum of weight fractions of liquid and solid phase Ca-Co Ca-a => W = Co-C Ca-CL Question 5. In normal motion, the load exerted on the hip joint is 2.5 times body weight. Calculate the corresponding stress (in MPa) on an artifcial hip implant with a cross-sectional area of 5.64 cm in a patient weighing 150 lbf. (1lbf-4.45 Newton)