In one study, the critical stress intensity factor for human bone was calculated to be 4.05 MPa√m. Assuming Y = 1.2 and there is a 2 mm crack present in the bone specimen, what would be the maximum tensile stress that may be applied before fracture occurs? If an average person standing on one leg has a weight of 1.4MPa, will this cause the bone to fracture with a 2 mm crack?

Apinion having 30 involute teeth of 6,5 module rotates at 220 r/min and transmits 2 kw to a gear wheel having 70 teeth; the addendum on both wheels is 4 of the circular pitch and the angle of obliquity is 200. determine; 3.1 the lengths of the path of approach and the arc of approach 3.2 the normal force between the teeth at an instant when there is only one pair of teeth in contact