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A construction company is bidding on a project comprising five high-rise buildings to be erected one after the other. The company considers the use of advanced, hydraulically operated tunnel forming systems to be purchased and used 60 times on each building over a l-yr period of time. The tunnel forms cost $28/sf.
No salvage value is expected at the end of the 5-yr project. As the two last buildings to be constructed slightly differ in their design, the forms will have to be modified at the Cl)st of $5/sf.
Periodical maintenance is expected every 120 uses at a cost of 5% of the purchase cost. Consider an annual interest rate of 4%. What is the expected average material cost per sffor each use?
a liquid spray nozzle is designed to produce a specific size droplet with diameter d. the droplet sized depends on the
Backlash is a nonlinearity, which is often displayed by robots having gear trans missions. Indicate why it is difficult to compensate for backlash by using sensing and feedback control. What are the preferred ways to eliminate backlash in robots?
consider a reheat cycle with steam leaving the boiler and entering the turbine at 4 mpa and 400 c . after expanded in
Does the Rankine degree represent a larger or smaller temperature unit than the Kelvin degree? Explain. Specified states, the change in temperature between the end states is independent of details of the process.
steam enters an adiabatic turbine at 20 mpa and 600?c state 1. at an intermediate stage 20 of the inlet steam is bled
A 25-g bullet is traveling with a velocity of 425 m/s when it impacts and becomes embedded in 2.5 kg wooden block. The block can move vertically without friction. Determine a) the velocity of the bullet and block immediately after impact,
All calculations and assumptions must be provided together with a full explanation of all the terms
Steam at a pressure of 14.7psia and a temperature of 320deg F enters a diffuser inlet at a velocity of 500ft/s. The steam decelerates in the diffuser to a velocity of 100ft/s. The steam leaves the diffuser as saturated vapor at 240 deg F. The area of..
a power cycle operates between a reservoir at temperature t and a lower temperature reservoir at 280ok. at steady state
a wheel can be modeled as a thin ring having mass 10 kg and four spokes made of slender rods each of mass 2 kg. the
consider a well sealed well insulated room with a common household refrigeratorfreezer unit. a what type of energy
A dump truck is shown in the figure. The loaded container has a mass of 8000 Kg and may be modelled as a solid homogeneous block. The hydraulic cylinder applies a force of 300 kN to the container in the starting position shown.
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