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The City of Brussels is installing a new swimming pool in the municipal recreation centre. Two designs are under consideration, both of which are to be permanent (i.e., lasting forever). The first design is for a reinforced concrete pool which has a first cost of €1 500 000. Even' 10 years the inner surface of the pool would have to be refinished and painted at a cost of €20 0 000. The second design consists of a metal frame and a plastic liner, which would have an initial cost of €50 0 000. For this alternative, the plastic liner must be replaced every 5 years at a cost of €10 0 000, and even" 15 years the metal frame would need replacement at a cost of €15 0 000. Extra insurance of €500 0 per year is required for the plastic liner (to cover repair costs if the liner leaks). The city's cost of long-term funds is 5%. Determine which swimming pool design has the lower present cost.
if a 150 lbf person wants to bungee jump from a bridge that is 400 feet above the surface of a river and the bungee
If the mean temperature in the chamber is 811 K and the pressure ratio of expansion in the turbine is 4:1, calculate the isentropic enthalpy drop in the turbine per unit mass of gas.
A gas mixture at 675.0°C and 113 kPa absolute enters a heat exchanger at a rate of 69.0 m3/hr. The gas leaves the heat exchanger at 245.0°C. The change in enthalpy of the gas during the cooling process is -6.80 kJ/mol.
Calculate the line parameters for a coaxial line with inner radius a = 1 mm, outer radius b = 4 mm, and material parameters as in Figure 14.9. The line operates at 60 Hz.
a velocity field is specified as v ax2i bxyj where a 2 m-1s-1 b -4 m-1s-1 and the coordinates are measured in
consider flow of water over a flat plate of length 5 m. on one graph plot the both the drag caused by shear stress and
1. what would be the percent change in deflection if a solid rectangular beam has its unsupported length changed from
the driveshaft of a buildings air-handling fan is turned at 300 rpm by a belt running on a 0.3- m-diameter pulley. the
for a pendulum in a gravity field with point mass m and length l from mass to the pivot derive the nonlinear equation
packages are thrown down an incline at a with a velocitynbspof 1 ms. the packages slide along the surface abc to
A closed system consisting of 8.25 lb of a gas undergoes a process during which the relation between pressure and volume is pV^n = constant. The process begins with p1 = 18 lbf/in^2 , v1 = 1.25 ft^3 /lb and ends with p2 = 53 lbf/in^2 , v2 = 0.5 ft^3 ..
the structure of a house is such that it loses heat at a rate of 5400 kjh per degree celcius difference between the
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