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HZ Wireless must rebuild a cell tower recently destroyed by a tornado. A tower made of normal steel (NS) will cost $30,000 to construct and should last 15 years. Maintenance will cost $1000 per year. If corrosion-resistant steel (CRS) is used, the tower will cost $36,000 to build, but the annual maintenance cost will be reduced to $250 per year.
a. Determine the IRR of building the corrosion-resistant tower. (Hint: Calculate interest rates from 7% to 11% using formulae provided in tables).
b.If HZ requires a return of 9% on its capital projects, which tower should be chosen? (Use linear interpolation for the IRR between integral values).
c. If the design life is just 5 years, which tower should be chosen and why?
What will be the value of the vertical stress at this point immediately after the fill is placed, before any consolidation has occurred. What will it be after consolidation is completed.
The platform itself weights 30 kN in air, and each cylinder weighs 1.0 kN per meter of length. What total cylinder length L is required for the platform to float 1 m above the water surface
For a .15 micrometer diameter spherical particle (density of particle = 2500 kg/cubic meter) determine the Cunningham correction factor at standard conditions.
Vehicles A and B are traveling toward each other in the opposing lanes on a straight segment of a two-lane highway at 35 and 40 mph respectively. If the critical rates of angular change of the two drivers are 0.0065 and 0.0055 rad/s, determine
A small building that shelters a water supply pump measures 2 m x 3 m x 2.4 m high. It is constructed of 1- cm thick wood having a thermal conductivity of 0.126 W*m^-1*K^-1.
The James River flows in from the East at 50 m^3/s and joins the Jackson River flowing at 500 ft^3/min just outside Charlotte, NC. The turbidity in the James River is 6.8 NTU.
After injecting 50 MMSCF (14.7 psia and 60 oF), the pressure increase from 2500 to 3500 psia. Deviation factors for the gas are 0.90 at 3500 and 0.80 at 2500 psia and the bottom-hole temperature is 160 oF. What is the cubic feet of gas storage spa..
One kilogram of air (which behaves as an ideal gas) in a piston-cylinder assembly is subjected to two separate processes from the same initial to the same final state: at the initial state the air has a volume of 1,000 L, a pressure of 10^5 N/m2,
Some organisms live in shallow ponds, where much of the water will evaporate during the warm, sunny, summer months. How will the concentration of solute change in the water druing this time
A cylinder fitted with a frictionless piston contains 2 kg of superheated refrigerant R-134a vapor at 350 kPa, 100oC. The cylinder is now cooled so that the R-134a remains at constant pressure un- til it reaches a quality of 75%.
An area that varies in elevation from 463ft - 634ft is being mapped. What contour intervals will be drawn if a 50ft interval is used? Which lines are emphasized?
A steel bolt and nut are tightened around an aluminum sleeve. Find the internal forces as the nut is rotated 1 turn
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