Ahollow circular steel strut with its ends position fixed has a length of 2.5m, its external diameter being 10 cm and its internal diameter is 8.8 cm. before, loading, the strut is bent with a maximum deviation of 0 45 cm: assuming that the centre line ofthe strut is sinusoidal, determine the maximum stress due to a central compressive end load of 10 kn. take e 210 gpa.

At 12 noon, the count in a bacteria culture was 400; at 4: 00 pm the count was 1200 let p(t) denote the bacteria cou population growth law. find: (a) an expression for the bacteria count at any time t (b) the bacteria count at 10 am. (c) the time required for the bacteria count to reach 1800.

Draw the engineering stress-strain curve for (a) bcc; (b) fcc metals and mark important points.

Plot schematically the tensile stress versus strain curves for a typical thermoplastic material at a temperature below its glass transition temperature (tg and at a temperature above its tg, respectively. do the same for a typical thermosetting material. list in a table any differences or similarities between the two materials at t> tg and t < tg, respectively, and relate them to the structures of the two types of polymers