At a temperature of 90C, a steel tire 10 mm thick and 75 mm wide that is to be shrunk onto a locomotive driving wheel 1.8 m in diameter just fits over the wheel , which is at a temperature of 20C. Determine the contact pressure between the tire and wheel after the assembly cools to 20 C. Neglect the

deformation of the wheel caused by the pressure of the tire. Assume a =11.7m/(m.C) andE=200x10 N/m .