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A manually cleaned bar screen has bars with a thickness of 8-mm (0.31-in) and openings 25-mm (0.98-in). After operating for a period of time, assume that the opening size decreases to 10-mm due to the accumulation of materials (debris) on the screens. If the approach velocity is 0.68 m/s (2.3 ft/s), determine if the screen needs to be cleaned. Why or why not?
The driver of the vehicle does not look for oncoming traffic. Road conditions and vehicle speeds on the highway are such that it takes 1.5 seconds for an oncoming vehicle to stop once breaks are applied.
what are the isrm standard for uniaxial tensile stress , ucs ,punch shear test and point load test for testing a rock sample
A 5 cm diameter, 6 m high pole is fixed in concrete. The pole supports a circular 4 m diameter sign. Estimate the maximum moment that must be resisted by the concrete for a wind speed of 30 m/s (wind is assumed normal to the sign; density of air = 1...
Steam flows steadily through an adiabatic turbine. Theinlet conditions are 10 MPa, 450 C and 80 m/s. and the exitconditions are 10 kPa, 92% quality at 50 m/s.
A stream is in equilibrium with atmospheric oxygen upstream of a waste outfall. The waste outfall creates a BODo of 20 mg/L in the stream. The k(BOD) is 0.4 /day and the k(o2) is 1.4 / day. The stream temperature is 15 degrees Celsius.
a tower is surrounded by a wall that is 10 m high and 30 m away from the base of the tower. compute the length of the shortest ladder that can stand outside the wall and lean against the tower.
At a specified point on a highway, vehicles are known to arrive according to a Poisson process. Vehicles are counted in 20-second intervals, and vehicle counts are taken in 120 of these time intervals.
Identify the forces that work against the success of cladding systems in keeping the elements out.
You are the Chief Civil Engineer for the Enhanced Protein Production Plant on the planet Zog where the gravitational constant is 15 ft/s2. A protein storage tank has developed a structural problem and must be drained. There is a 6 inch diameter orifi..
An overhanging beam ABC is subjected to a couple MA at the free end (see figure). The lengths of the overhang and the main span are a and L, respectively. Determine the angle of rotation and deflection at end A.
Fluid flows steadily, at a volume rate Q, through a large pipe and then divides into two small pipes, the larger of which has an inside diameter of 25 mm and carries three times the flow of the smaller pipe.
In order to move a wrecked truck, two cables are attached to the truck at A and pulled by winches B and C as shown. Determine the components and magnitudes of the vectors AB and AC
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