A rubber cylinder A with a diameter of 50 mm and a height of 80 mm is pressed into a steel cylinder B with a force P. The cylinder is pressed together by 1 mm. The inner diameter of the steel cylinder is also 50 mm and it is assumed to be completely rigid. Poisson's ratio of rubber is 0.45. Calculate the surface pressure on the inner surface of the steel cylinder. E rubber-20 MPa. 0