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1. Suggest six reasons why software dependability is important in most sociotechnical systems.
2. What are the most important dimensions of system dependability?
3. Why do the costs of assuring dependability increase exponentially as the reliability requirement increases?
a domestic water heater holds 189 l of water at 60 degrees c 1 atm. determine the exergy of the hot water in kj. to
two workstations are being conciered by your company. machine 1 costs 12000 new and 1300 to operate and maintain each
an adiabatic air compressor receives ambient air at 300k and 100 kpa and compresses it to 1000 kpa. if the isentropic
a piston-cylinder assembly initially contains 0.5 m3 of air at 102 kpa and 90oc. the air is now compressed to 0.2m3 in
an air conditioning unit with refirigerant-134a as the working fluid is used to keep a room at 26 degrees celcius by
an adiabatic steam turbine operates at steady state with inlet conditions p1500 kpa t1360 c steam leaves the turbine at
Determine the reliability of a system having a capacity that is lognormal with a median of 100 and s = 0.6 subject to a load that is lognormal with a median of 20 and s = 0.8.
a water barometer was observed at a school on a recent trip. it was basically a tube filled with water in a container.
A heat pump operating at steady state provides 36,000 kJ/hr to maintain the temperature in a building at 22C. The heat pump operates with a coefficient of performance 75% that of a reversible cycle operating between the same thermal reservoirs.
A sheet of epoxy reinforced with 60% unidirectional E-glass fibers, where x is the fiber direction. Strains ex= 0.0030, ey=-0.0020, and yxy = .0025 are measured. Estimate the applied stress ox, oy, txy
Determine the rate of heat loss from the molten salt per meter length of the pipe.
an automobile travels at 30 mph which is also the speed of the center c of the tire. if the outer radius of the tire is
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