4. using the creep curves for polypropylene, estimate a) the e after 7x105 seconds. b) the length and diameter after 7x105 s of sample with an initial length of 112 mm and an initial diameter of 10.1 mm subjected to a constant force of 295 n. poisson’s ratio for this polymer is 0.36.

Acompressor compresses a gas, a pump compresses a liquid. for a given pressure ratio, why does it take more work to compress a gas in a compressor than a liquid in a pump? a)- for a given pressure ratio the average specific volume for a gas is much higher than the average specific volume for a liquid. b)- there is no difference. the only difference is the amount of heat generated (not work) c)- for a given pressure ratio the average volurge for a gas is much higher than the average volume for a liquid. d)-there is no difference