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A firm is deciding wheter to buy or rent equipment. How many days would they need to use the equipment each year to justify purchasing the equipment? To purchase equipmet/ Buy at $60,000, Operation and maintanence is $120/day, life is 5 yrs and salvage value is $5000. To Rent: is $400/ day, life is 5 yrs. Use a interest rate of 5%. Which alternative would be better if the equipment is operated 25 days per year?
Perform a material balance on substrate (S) around a chemostat (completely mixed reactor without recycle) assuming a first-order removal for a substrate with a rate constant of 0.5 hr-1. The influent substrate concentration is 150 mg/L
the boiling point of water decreases wiht elevation because of the pressure change. what is the boiling point of water at an elevation of 2000m and at an elevation 4000 m for standard atmospheric conditions
Design a balcony slab exposed to the weather. The cantilevered span is 8 ft and the service live load is 100 psf. fc' = 4,000 psi, fy = 60,000 psi.
a cantilevered bean has a lenght of L, a cross section area of A, and a flecural rigidity of EI. The free end is free to rotate and displace due to bending. derive the stiffnes of the cantilevered bean. Assume small deformations.
What is the Hydraulic Radius of Trapezoidal channel that has a bottom width of 9 feet, side slopes 3:1 (H:V) and the flow depth is 6 feet.
The compressive strength of concrete has a (population) mean of 2500 psi and a (population) standard deviation of 50 psi. Find the probability that a random sample of n= 5 specimens will have a sample mean strength
The velocity of the bed is limited to a maximum value of 150mm/s to the right and 300mm/s to the left; the acceleration is successively equal to 150mm/s^2 to the right, zero 150 mm/s^2 to the left, zero, etc.
Comparison between steel structures and aluminium structures, To make a comparison between Eurocode 3 and Eurocode 9 outlining the main differences
The beam is loaded with a concentrated live load of 10 kips at the center of its span, in addition to its own weight.. The dead load includes the beam weight. The steel is A242, Grade 50.
The plant treats 1.8MGD (million gallon per day). The water entering this unit has about 4500mg/L of coliforms, and the effluent target is 0.1 mg/L of coliforms.
5 Kg of water at 1.2 MPa, 120oC is contained in a frictionless piston-cylinder device. The water is heated until its temperature reaches 250oC. a) a)Determine the work performed in kJ
A family of six in a five bedroom house would like to treat their wastewater in an onsite septic system, constructed wetland, and tile drainage (leach field) system. They will be generating a maximum of 1.2 m3/d of septic tank effluent.
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