1-1. Assume that a 50-kg runner trips and falls on his extended hand. If the bones of one arm absorb all the kinetic energy (fE) (neglecting the energy of the fall), what is the minimum speed of the runner that will cause a fracture of the arm bone? Assume that the length of arm is 1 m and that the area of the bone is 4 cm?. 1-2. Repeat the calculations in Exercise 1-1 using impulsive force considerations. Assume that the duration of impact is 10-2 sec and the area of impact is 4 cm?. Repeat the calculation with area of impact=1 cm². 1-3. From what height can a 1-kg falling object cause fracture of the skull (K** )? Assume that the object is hard, that the area of contact with the skull is 1 cm², and that the duration of impact is 10-3 sec.

1-1. Assume that a 50-kg runner trips and falls on his extended hand. If the bones of one arm absorb all the kinetic energy (fE) (neglecting the energy of the fall), what is the minimum speed of the runner that will cause a fracture of the arm bone? Assume that the length of arm is 1 m and that the area of the bone is 4 cm?. 1-2. Repeat the calculations in Exercise 1-1 using impulsive force considerations. Assume that the duration of impact is 10-2 sec and the area of impact is 4 cm?. Repeat the calculation with area of impact=1 cm². 1-3. From what height can a 1-kg falling object cause fracture of the skull (K** )? Assume that the object is hard, that the area of contact with the skull is 1 cm², and that the duration of impact is 10-3 sec.