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a. Show that the rate at which shaft work is obtained or required for a reversible change of state in a closed system at constant internal energy and volume is equal to the negative of the product of the temperature and the rate of change of the entropy for the system.
b. Show that the rate at which shaft work is obtained or required for a reversible change of state in a closed system at constant entropy and pressure is equal to the rate of change of enthalpy of the system.
2 kg of helium gas is initially contained in a rigid tank at 100 kpa and 27 c. the paddle wheel is now turned be an
a cube of aluminum 10 cm on each side is initially at a temperature of 300degc and is immersed in a fluid at 100degc.
a container is supported by three cables that are attached to a ceiling as shown. determine the weight w of the
Determine the turbine inlet temperature, the cycle thermal efficiency, and the back-work ratio of this cycle.
a machine with a rotating shaft has a total weight of 90 kg and is supported by springs. the damping constant for the
Demonstrate suitable accuracy by using a simple hand calculation for the static analysis of the structure. Describe in detail the hand calculations performed to validate the final solution. What is the approximate error between the simplified hand..
0.09m3 of a fluid at 0.7 bar are compressed reversibly to a pressure of 3.5 bar according to a law pvnconstant. the
determine the specific volume of superheated water vapor at 15mpa and 350oc using a the ideal gas equation b the
estimate the common logarithm of 10 using linear interpolation.a interpolate between log80.9030900 and log121.0791812.b
air flows in a round pipe at a rate of 0.015 lbmsec. the air enters the pipe at a temperature 76.8 of and a pressure
a closed system consisting of 14.5 lb of air undergoes a polytropic process from p1 80 lbfin2 v1 4 ft3lb to a final
consider 2.0 kg of a 99.6 wt fe-0.4 wt c alloy that is cooled to a temperature just below the eutectoid. a how many
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