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A pressure washer or power washer is a machine commonly used to clean mildew and dirt off houses, driveways, sidewalks etc. It attaches to a common garden hose, pumps pressure of water up, and lets it flow through a small nozzle at the end of a wand. The force of the resulting water jet physically knocks the mildew off. Estimate the maximum force (lbs.) that a water jet from a powerwaher can make on a glass window. Assume the water jet flows from the nozzle at a velocity of 40 ft/s. Also assume the jet is round with a diameter of 0.25 in.
A beryllium copper wire having diameter of 1-50 mm and length of 40mm is used as a small torsion bar in an instrument. determine what angle of twist would result in the wire when it is stressed to 250 mpa.
The headloss per meter for galvanized iron pipe (.02 m diameter) hL= 0.110m and for (0.15m diameter) hL= 0.490m. Determine the trade off between the cost and the head loss (hL).
the recommended threshhold limit value ( TLV-ACGIH) air concentration for occupational exposure to water-insoluble hexavalent chromium Cr (VI) is 0.01 mg/M^3. this concentration is based on an assumption that the individual is generally healthy an..
what is the equivalent PF rate constant that would be used to describe treatment in a series of three CM reactors in terms of flow (Q), the total volume in the system (V), and the rate constant observed for the CM system
No incisions are noted. Find the maximum axial tension using LRFD. Can we resist the same force in compression if the member is 10ft long?
The lubbock board of city development has decided to ask the city council to construct a tunnel under the snowcapped mountain range east to downtown lubbock so that out of town visitors can reach historic prairie dog town.
The three hinged arch is composed of segments of a circle. Support points A and D are not at the same level.Determine: (a) the horizontal and vertical components of reaction at A and D.
average flow rate = .0022 m^3 /s (190 m^3 /d) Influent Substrate concentration = 250 mg/L as COD (all essentially soluble) Mean cell residence time is to be 5 days Volume of mix tank = 25 m^3 the reactors kenetic constants are
During construction of a highway project, a soil sample was taken from compacted earth for a sand-cone in place denstiy test. The following data were obtained from the test. Weight of sand used to fill test hole and funnel of sand-cone device= 845..
A square footing 2 meters by 2 meters is to be constructed 1.22 meters below the ground surface. The groundwater table is located 1.82 meters below the ground surface.
Knowing that end B of the tape is pulled downward witha velocity of 300 mm/s and that at the instant of the total thickness of the tape on the spool is 20 mm, determine (a) the instantaneous center of rotation of the spool,
A spherical gas container made of steel has a 5-m outer diameter and a wall thickness of 6 mm. Knowing the internal pressure is 350 kPa, determine te maximum normal stress and the maximum shearing stress in the container.
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