Compare three alternatives on the basis of their capitalized costs at i = 10% per year. Alternative E F G
First cost, $ −50,000 −300,000 −900,000
AOC, $ per year −30,000 −10,000 −3,000
Salvage value, $5,000 70,000 200,000
Life, years 2 4 [infinity]

Note that the LCM of 2, 4 and [infinity] is [infinity]

The temperature of air decreases as it is compressed by an adiabatic compressor. a)- true b)- false

If a particle moves along a path such that r : (3 sin t) m and ? : 2t rad, where t is in seconds. what is the particle's acceleration in m/s in 4 seconds? a)- 16.43 b)- 16.29 c)- 15.21 d)- 13.79

Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.