Ashaft made of aisi 1020 cold-drawn steel rotates at 1600 rpm and transmits 8 hp. (a) using the maximum shear stress theory, determine the minimum acceptable diameter of the shaft so that there is a factor of safety of 1.8. (b) suppose the shaft still transmits 8 hp, but now the shaft rotates at twice the original speed, i. e., at 3200 rpm. before doing a calculation, can you speculate about whether the required minimum diameter would increase, decrease or stay the same? do the calculation. did it turn out as you expected?

Apiston-cylinder with a volume of 0.25 m3 holds 1 kg of air (r 0.287 k/kgk) at a temperature of 100 c. heat transfer to the cylinder causes an isothermal expansion of the piston until the volume triples. how much heat is added to the piston-cylinder?

Describe one experiment in which the glass transition temperature and melting temperature of a totally amorphous thermoplastic material can be determined. show the relevant experimental results in a diagram which should be properly annotated with the two temperatures clearly marked. what is likely to happen to the curve in the diagram if the amorphous polymer is replaced by a thermosetting type?

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