(a) Compute the Poisson’s ratio for a material that is undergoing a uniaxial tensile test with zero dilation. (b) A student was given three different unidentified materials to determine their Posson’s ratio. She determined the Poisson’s ratios to be 0.5, 0.3, and 0. She needs your help in identifying the class of material for each of these values.

An inventor claims to have developed a reversed heat engine (ie. a heat pump) which is able to deliver 10 kj heat into the room at 20°c from outside ambient temperature of -10°c by consuming only 2 kj electricity in winter. this claim is a)-impossible b)-possible only if the heat pump is ideal c)-practically possible d)-unable to be assessed as it depends on the working fluid used in the heat pump.