What diameter of a steel rod is required to support a tension load of 44.5 kn? assume that the allowable stress for the steel is f=165n/mm^2

For me a person with a phd and who knows what there talking about.i know the chances of a radiation leak is low but if it does the area within a 96.3 mile radius would be unusable because of contamination

Answer(a)   the matererials that are in contact, the two materials and the nature of their surfaces/// (b)/// the force pushing the two surfaces together, pushing the surfaces together causes the more of the asperities to come together and increases the surface area in contact with each other

Because they're in different places for this the temperature varies.