A) Steel train rails are laid in 12.2 m -long segments placed end to end. The rails are laid on a winter day when their temperature is-2.00degrees C. How much space must be left between adjacent rails if they are just to touch on a summer day when their temperature is 33.0 degrees C ?

d = _____ mm

B) If the rails are mistakenly laid in contact with each other, what is the stress in them on a summer day when their temperature is 33.0 degrees C ?

= _____ Pa