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Cars arrive at a toll gate on a freeway according to a Poisson distribution with mean 90 per hour. Average time for passing through the gate is 38 seconds. Drivers complain of the longwaiting time. Authorities are willing to decrease the passing time through the gate to 30seconds by introducing new automatic devices. This can be justified only if under the oldsystem the number of waiting cars exceeds 5. In addition, the percentage of the gate's idletime under the new system should not exceed 10%. Can the new device be justified?
Torque is transferred through two shafts by means of gears. If the diameters of gears B and C are in the ratio 1:2, what should the ratio of shaft diameters be so that both shafts have the same shear stress
What is the maximum column load in kips that could be placed on a 4-ft square temporary footing on a sand for which the standard resistance is about N=15 and the water table is at the surface A factor of safety of 2 is to be maintained against bea..
Important information about Mechanical engineering dynamics, A 3000 lb car rests on a horizontal street out of gas with its brakes locked.
The line of sight of a level falls at a rate if 0.122ft/ 100 ft when the level bubble is centered. A backsight of 4.782 is taken on point A, which is at 75 ft from the level. the elevation of a is 425.238 ft.
The blower on an air conditioning unit produces 80 cubic feet per minute of air in the ductwork. What is the air flow in cubic meters per hour
Oxygen flows without a gain or loss of heat through a horizontal pipe of constant cross section. At section 1 the pressure 175 psia, the velocity is 78 fps, and the temperature is 50°F; at section 2 the pressure is 130 psia
Traffic signals were installed at an intersection involving two one-way streets. Suppose 75% of the vehicles will decelerate when they see the amber light, whereas 20% will accelerate and 5% are "indecisive" and simply continue with the same speed..
Make a list of threats which may be vulnerable to the company's information system.
coal has about 2% sulfur. How many kilograms of sulfur would be emitted from coal fired plints in the US in 1 yr US electricity production is about 0.28 * 10^12 watts, & coal has an energy content of about 30*10^6 J/kg
At noon on a sunny summer day with a surface wind speed of 4m/s, SO2 is released over rough terrain from a 90m stack at a rate of 400g/s. Assume that the plume rise is 60m.
Determine, for the crest and sag vertical curves required, the stationing and elevation of the PVCs and PVTs given that the PVC of the crest curve(on westernmost level highway section) is at station 0+00 and elevation 100 ft.
at a railroad crossing, an overpass must be built centered over the tracks at a height of 24ft and be 200ft long. the existing highway has a design speed of 50mi/hr.
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