$1.)$ A tensile stress is applied along the lomg axis of cylindirical brass rod. That has a diameter of $10mm.$ Determine magnitude of the load required to produce $2\mathrm{.}510-3mm$ change in diameter if the deformation is entirely elastic $($ poisson ratio $=0\mathrm{.}34/$ young modulus: $97$GPa $)$ Answer: $5600$N

$2.)$ Stainless steel rod is used as part of machine which will be rotated $3000$ cycle $/$min under $3000N.$ The steel rod diameter is $25mm$ and length is $300mm.$

a$.)$ Calculate the time that spare part will not broke? Answer: $50$ minutes

b$.)$ Please offer new dimension for that cylindrical part to be able to not break. Answer: diameter: $28\mathrm{.}9$ mm

$3.)$ Draw figure for creep rate versus stress and explain it $($When the stress is increased what will change in creep rate?$).$