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5-67. A certain medical device will result in an estimated $15,000 reduction in hospital labor expenses during its first year of operation. Labor expenses (and thus savings) are projected to increase at a rate of 7% per year after the first year. Additional operating expenses for the device (maintenance, electric power, etc.) are $3,500 annually, and they increase by $250 per year thereafter (i.e., $3,750 in year two and so on). It is anticipated that the device will last for 10 years and will have no market value at that time. If the MARR is 10% per year, how much can the hospital afford to pay for this device? Use an Excel spreadsheet in your solution. (5.3)
a 9 in radius cylinder of weight 18lb rests on a 6lb carriage. the system is at rest when a force p of magnitude 2.5lb
A centrifugal fan equipped with damper control has the damper wide open at full flow. The damper is partly closed to reduce flow to 80 percent of full load. Estimate the changes, in percent, in static pressure, and the horsepower requirement.
a fuel cell stack consists of 75 fuel cells arranged in series each one 12cm2 in size. the stack operates at 80.c and
2.2 lb of ammonia in a piston cylinder assembly undergoes two isothermal processes in series. The first process from an initial state where p1=120lbf/in^2 with a quality is 85% to a final state where the ammonia is saturated vapor. D
Determine the coefficient of kinetic friction µ,k be- tween the cable and the pipes, the maximum ten- sion T in the cable between the pipes, and the sag h in the cable.
The system shown anchors a stanchion of cable-suspended roof. If the tension in cable AB is 900 kN, what are the tensions in cables EF and EG?
a two-phase liquid-vapor mixture of h2o has a temperature of 300oc and occupies a volume of 0.05 m3. the masses of
a refrigerant 134a at 140 kpa and -10 degree celcius is compressed by an adiabatic 16kw compressor to an exit state of
What flow measuring devices are commonly used in industry? Explain the functioning of one such device.
Air expands isentropically from 1.5 MPa and 60 C (centigrade) to 0.4 Mpa. Calculate the ratio of the initial to final speed of sound.
consider the flow of air over a vertical flat plate at a low velocity u1 in ambient pressure p1. the plate surface
Calculate the fugacity of liquid hydrogen sulphide in contact with its saturated vapor at 25.5C and 20 bars. The vapor pressure of pure water at 310.6 K is 6.455 kPa. Compute the fugacity of pure liquid water at 310.6 K when it is under a pressure of..
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