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1) A person consumes about 2000 kcal of food each day. Assume that 25% of this energy goes to physical work and the rest is lost as heat.
A. Draw: If their body temperature is 98.6°F, what is their daily change in entropy associated with heat loss, in kcal/K.
B. Draw: Assume that they spend their time in a room that is maintained at 25°C. What is the total change in entropy of the universe associated with heat flow from this person, in kcal/K?
2) 5 kg/min of a heavy liquid oil enters a double-pipe heat exchanger at 77?F and leaves at 220?F. Heat is supplied by saturated steam at 30 psia, which condenses to form saturated liquid water. The heat capacity of the oil is 2.0 kJ/kg K. What is the total change in entropy associated with this process?
3) 250 mol/s of ammonia vapor at -33°C and 1 atm is compressed isentropically to 10 atm. Assume that the ammonia is an ideal gas. Find the outlet temperature of the gas and the work consumed by the compressor. For this problem, take the Cp=4.269R, where R is the gas law constant.
an ideal gas of mass 2 kg is contained within a rigid cylinder and undergoes a cycle which consists of three separate
an object of mass 4 kg stretches a spring 0.2m. the object is set in motion with an initial velocity of 1 ms downward
steam at a pressure of 0.08 bar and a quality of 93.2 enters a shell-and-tube heat exchanger where it condenses on the
consider a cold canned drink left on a dinner table. would you model the heat transfer to the drink as one two or three
a gas over liquid lifting device has a 200 gallon reservior in which the pressure within the reservior is raised by 200
an axial flow compressor stage has blade rootmean and tip velocities of 150200 and 250 ms. the stage is to be designed
find Torque at O2, and forces at O2, A and B, also calculate shaking force and shaking torque. MEE40003- Machine Dynamics
a fixed mass of water m initially a saturated liquid is brought to a saturated vapor condition while its pressure and
a) What is the temperature and state of the steam in the pipe? b) What is the quality of the steam in the pipe?
germanium forms a substitutional solid solution with silicon. compute the weight percent of germanium that must be
two circus performers pyramus and thisbe. pyramus will swing back and forth with amplitude 8 on a trapeze bar that
Describe on your own words the three strengthen mechanism for metals (i.e. grain size reduction, solid solution strengthening and strain hardening). Be sure to explain how dislocations are involved in each of the strengthening techniques.
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