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A structural tension member of 10 ft. long with a square cross-section is subjected to a load of 120,000 lb. There is a choice between an aluminum alloy and structural steel, with the following information given for each.
Aluminum:
Unit weight (lb/ft^3) 165ultimate strength (psi) 45,000modulus of elasticity (psi) 10.5*10^6cost per lb $0.45
Steel:
Unit weight (lb/ft^3) 490ultimate strength (psi) 90,000modulus of elasticity (psi) 30*10^6cost per lb $0.21
A) Which material will be cheaper if you want a factor of safety of 5? (F.S = ultimate strength/applied stress).B) Which material will result in the lightest member if you want to limit the elongation to 0.20 in.? Which material will be cheaper under these conditions?
Colette Lake has a surface area of 103 ha and a mean depth of 8 m. The pH of the water is 7.6. The lake receives surface water from a lake upstream, rainfall, and diffuse groundwater input. Atmospheric inorganic N deposition is insignificant.
Ethyl acetate is made from acetic acid and ethyl alcohol. Let x = pounds of acetic acid input, y=pounds of ethyl acohol input, and z = pounds of ethyl acetate output. The relationship of output to input is: z^2/(1.47x - z)(1.91y - z) = 3.9.
The channel cross section is rectangular in shape,with a bed width of 4 m and Manning n of 0.022. The bed drops by an average of 4.2metres every kilometre. The maximum flow in the channel is equal to 7 m3/s.
Plot the variation with depth (z) of the at-rest lateral earth pressure behind the wall, and determine the magnitude and location of the at-rest lateral earth force per unit length of wall.
Compare the total reactor volume required for 90% removal of a substance that decays according to first-order kinetics with a rate constant of 0.05 day -1 in a CM system that contains a single reactor against a system that contains three CM reacto..
The elastic ball bounces down a flight of rigid stairs. Determine the height h of the steps if all the trajectories between successive steps are identical. Use e=0.85 and the initial velocity 6 m/s.neglect friction.(teta=70 degrees)
for this purpose replace this force by its equivalent of two forces at At Ft parallel and Fn perpendicular to the beam. Determine Ft and Fn.
The water velocity is estimated to be 3.0 m/sec. Acetone has a density of 0.786 gm/mL and a half-life in water of 20.0 hr. Determine the concentration of acetone in the river due to this pulse release at distance of 2, 4, and 7 km from the site at..
QZY, Inc. is evaluating new widget machinesoffered by three companies. The machines have the following characteristics: A B C First cost $15,000 $25,000 $20,000 Maintenance and operating 1,600 400 900
An 80 kg astronaut took his bathroom scale (a spring scale) and a beam scale (compare masses) to the moon where the local gravity is g=1.67 m/s^2. Determine how much he will weigh
The 30-Mg freight car A and 20-Mg freight car are moving towards each other with the velocities of VA= 20km/h and VB=10 km/h. A spring mounted on A has k=3 MN/m Determine the maximum compression of the spring mounted on car A.
The total saturated thickness of the aquifer is 15 m. Predict the concentration distribution along the water table after 5110 days, assuming a linear groundwater velocity of 1.6x10-3; dispersivities in x, y, and z of 5.0 m, 0.5 m, and 0.1 m
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