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Explain why it is important to model the context of a system that is being developed. Give two examples of possible errors that could arise if software engineers do not understand the system context.
How might you use a model of a system that already exists? Explain why it is not always necessary for such a system model to be complete and correct. Would the same be true if you were developing a model of a new system?
a 1200 lb wrecking ball with a velocity of 4 fts at the bottom of its arc strikes a wall and comes to rest in a
Using the appropriate table, determine the change in specific entropy between the two specified states, in Btu/lb.oR. Show the states on a sketch of the T-s diagram.
a 4 l volume of pressure cooker in a kitchen operates at 200 kpa with an exit area of 10 mm2. with well controlled heat
to understand the physics of the o-ring we may need to start formulating the problem in a static equilibrium condition.
A cylinder-piston assembly contains saturated liquid (H20) at 500F. The piston is 1 inch from the bottom of the cylinder. The system undergoes a constant temperature in which the fluid expands and the piston is raised to 86.45 inches above the bottom..
Determine the rate of heat loss from the molten salt per meter length of the pipe.
a vertical piston-cylinder assembly with 0.2 kg of water is initially a saturated vapor. the piston has a diameter of
steam enters an isentropic turbine at 7 mpa and 500 degrees c with a mass flow rate of 3.2 kgsec. the pressure of the
a four-cylinder two-stroke 2.0-l diesel engine that operates on an ideal diesel cycle has a compression ratio of 22 and
Refrigerant 22 enters an insulated compressor operating at steady state as saturated vapor at -16oC with a mass flow rate of 1.5 kg/s. Refrigerant exits at 7 bar, 70oC. Changes in KE and PE from inlet to exit can be ignored.
A cube of linear elastic material is subjected to a vertical compressive stress sigma1 in the 1-direction, but it is now constrained ( e = 0) in both the 2- and 3- directions. Find expressions for the induced transverse stresses, sigma2 and sigma3 in..
a 50-kg iron block and a 20-kg copper block both initially at 80oc are dropped into a large lake at 15oc. thermal
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