Aprocess cannot be totally reversible if it has: a. heat transfer through a temperature difference b. frictionless surfaces c. a single pure substance d. internal reversibility

For a gate width of 2 m into the paper, determine the force required to hold the gate abc at its location.

The sum of the normal stresses does not change as the stress state rotates through an angle. a)-trune b)- false

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