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You own several copiers that are currently valued at RIO 000 all together. .Annual operating and maintenance costs for all copiers are estimated at R9000 next year, increasing by 10% each year thereafter. Salvage values decrease at a rate of 20% per year.You are considering replacing your existing copiers with new ones that have a suggested retail price of R25 000 . Operating and maintenanc e costs for the new equipment will be R6000 over the first year, increasing by 10% each year thereafter. The salvage value of the new equipment is well approximated bv a 20% drop from the suggested retail price per year. Furthermore , vou can ge t a trade - in allowance of R12 000 for your equipment if you purchase the new equipment at its suggested retail price. Your MARR is 8%. Should vou replace vour existing equipment now?
Determine the clear day and cloudy day illuminances on a horizontal skylight at noon on June 21 and December 21
Find and plot the normalized field array antenna radiation patterns for the following number of elements N, spacing h, phase constant β= π [rad/m] and phase angle φ of each consecutive element with respect to the previous element starting with zer..
an insulated 0.15 m3 rigid tank initially contains air at 27c and 3 bar. the tank is connected by a valve to a supply
A steel circular bar (\sigmayp =250 MPa) of d=60-mm diameter is acted upon by combined moments M and axial compressive loads P at its ends. Taking M=1.5KN.m, determine, based on the maximum energy of distortion theory of failure, the largest allowabl..
design a container using differentiation that has a volume of 2500 litres. it must use the minimum amount of material.
The second cycle receives energy by heat transfer from the reservoir at temperature T and rejects energy by heat transfer to a higher- temperature reservoir at 1440 K. If the heat pump cycles have the same coefficient of performance, determine (a)..
a compressor raises the pressure of 3kg of air gamma 1.4 adiabatically from 100kpa 288k to 450kpa. the electric motor
a fine copper wire0.07-cm diameter is initially heated to 175c. the wire is suddenly exposed to an environment at 40c
Discuss in detail how the various thermal, visual and auditory factors can affect the comfort of the users of these spaces. State clearly any acceptable parameters that are relevant in your discussion. Justify the values you have stated.
a steam power plant operates on an ideal rankine cycle with boiler pressure of 100 bar no pressure drop across the
Determine the uniform tube wall surface temperature for these conditions. 0.050 kg/s. If a particular drying process requires approximately 1 kg/s of air at 75°C,
a thin-flat plate having a length of l 10 cm is heated by a constant-heat flux from the bottom and cooled by an air
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