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Each pylon of the cable stayed bridge has a cable that supports the deck and a backstay. Say the supporting cables carry 70% of the weight of the bridge which weighs 50 Mg. Even though the pylon is built-in at the bottom, the tensions in the backstays are chosen so that the net horizontal force on a pylon due to the two cables is zero. Say the steel pylon consists of two separate box sections, 800 mm x 1000 mm 20 mm thick on the two sides of the deck that join at a certain point above the deck. Let the cables be attached to the pylons at height h, below which the two box sections are separated and equally share the loads of the cables. Determine the maximum allowable height, h, if the box sections are not to buckle in the weaker direction. Take the angles
Consider some hypothetical X+ - Y - ion pair for which the equilibrium interionic spacing and bonding energy values are 0.38 nm and - 6.38 eV respectively. If it is known that n in the equation has a value of 10, determine the expressions for attract..
What determines the minimum value of the duration of the output pulse
Find the concrete cross-section and steel area required for a simply supported rectangular beam with a span of 20 ft that is to carry a computed dead load of 1.3 k/ft and a service live load of 2.25 k/ft. Material strengths are fc’ = 5000 psi and fy ..
A thermal reservoir (T=308K) is brought in contact with the tank, transferring enough heat to the tank to raise the pressure inside to 4 bar. Calculate the entropy changes of the refrigerant and the thermal reservoir
If the flowrate is Q = 25 ft^3/s and the upstream depth is 2 ft, determine the downstream depth. Sketch the specific energy diagram and indicate its important characteristics. Note that the specific discharges are different.
The decarburization of carbon from a steel with an overall composition Co = 0.3wt% carbon can be expressed by the equation: Cx= Co.erf(z). If the steel is decarburized in vacuum at 1000 C for one hour, calculate the carbon concentration in steps of 0..
refrigerant 134a is compressed at steady state from 2.4 bar, 0 degrees celcius, to 12 bar, 50 degrees celcius. Refrigerant enters the compressor with a volumetric flow rate of 0.38m^3/min, and the power input to the compressor is 2.6 kW.
Consider a system that consists of 4 devices. The probabilities of failure for each of the devices are, respectively: 10%, 25%, 20%, and 30%. (a) If these components were in series, what is the probability that the system operates
Air is compressed from an initial state of 100 kpa and 170 *C to a final state of 600 kpa and 57 *c. Determine the entropy change of air during the compression process by using a) property values from the air table and b) average specific heats
If the maximum stress that the tank can sustain equals 22.857 ksi, determine the required thickness (to the nearest 1/4 inch). If the tank wall thickness is specified to be 2.25 inches.what is the maximum internal pressure
Giving the classes, explain how rocks are put intofive (5) classes by each of the above parameters. Alsogive the parameter rating in each of the fiveclasses. Hint; use a table to answer this question
.An air turbine is used with a generator to generate electricity. Air at the turbine inlet is at 700 kPa and 25 degree C. The turbine discharges air in to the atmosphere at a temperature of 11 degree C.Inlet and outlet air velocities are 100 m/s and ..
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