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Four signs are mounted on a frame spanning a highway, and the magnitudes of the horizontal wind forces acting on the signs are as shown. Determine the magnitude and the point of application the resultant of the four wind forces (distance right of AB, and distance below BC) when a=1.5ft and b=13ft.
A 1 L beaker contains a material that decays at a first order rate of 0.25/day. How long will it take for the concentration in the container to be reduced to 10 % of its originalvalue
What size of orifice is needed to produce a change in head of 9m for a discharge of 2 m^3/s of water in a 1-m diameter pipe.
you measure the average headway and average spacing of passing vehicles as 3.2 seconds and 165 ft, repsectively. calculate the flow, average speed, and density of the traffic stream in this lane.
design a square individual footing to support a 16 inch square reinforced concrete column. service loads include a dead load of 180 kips and a live load of 140 kips. both column and footing have fc=3000psi and fy=60000 psi.
SAMPLE B:has size 10,mean 20 and variance 36 .calculate pooled sample variance
calculate the magnitude and direction of the horizontal force exerted on the contraction (not on the water). Assume that there is no loss of energy in the contraction. Use the gamma of water is equal to 1000 kg/m^3
A 600 MW power plant has an efficiency of 36 percent with 15 percent of the waste heat being released to the atmosphere as stack heat and the other 85 percent taken away in the cooling water.
determine the number of bricks and cubic feet of mortar required for 100 square feet of wall. the ties are to be spaced 16 inches on center vertically and 24 inches on center horizontally
Given that the gate is 3 m wide and will just start to open when water height reaches 6 m, determine the weight of the gate.
To avoid the salinization of soil in a farming area, parallel drainage canals are to be installed to maintain the water table at a depth of at least 4m below the ground surface. It is thought that no evapo-transpiration would occur below that dept..
Determine the percent error n in replacing the sine and the tangent of an angle by the value of the angle in radians for angle values 5 degrees, 10 degrees, and 20 degrees. Explain the qualitative difference between the sine and tangent results
A 50-ohm electrical resistor carries a current of 5 amperes. The resistor is maintained at a temperature of 30o C. Determine the rate at which heat must be transferred to the surroundings
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