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The elevator of a large building is to raise a net mass of 400 kg at a constant speed of 12 m/s using an electric motor. Minimum power rating of the motor should be
(a) 0 kW
(b) 4.8 kW
(c)47 kW
(d) 12 kW
(e) 36 kW
Determine the projected component of the force fac along the axis of strut ao. Express the result as a cartesian vector.
Using a safety factor of 2.00 and neglecting the pile dead weight, find the length of a 1' diameter circular concrete pile required to take a design load of 50 kips in a soil composed of two layers.
You are assigned the task of using bioremediation to cleanup a hazardous waste site contaminated with Tetrachloroethylene. The site is a shallow surficial sandy aquifer 30 feet deep underlain by a clay unit. The depth to the watertable is 10ft.
A movable cone fits inside a stationary conical depression. If a torque is applied to the cone, the cone will rotate at a certain speed depending on the angles θ and β, the radius r o, and the viscosity μ of the liquid.
In an oedometer test, the void ratio of a clay sample changed from 1.62 to 1.41 as the vertical effective stress imposed on the sample was increased from 100 kPa to 200 kPa. Later on, the vertical effective stress on the sample was decreased
You have a contaminated air stream containing 1000 ppmV of toluene and you decided to incinerate to a DRE of 99.9%. You are using butane as fuel to reach the temperature and consider the lean toluene has no heating value.
A 50 meter wide rectangular channel is carrying a flow of 250 m3/s at a flow depth of 5 meters. To produce critical flow in this channel, determine
The half life of Uranium-238 is 4.47 billion years. What is the reaction rate coefficient assuming first order decay
The water enters at 1 atm at 10 C and the flow rate through the turbine is 40 m3/s. The water is discharged from the turbine 200 m below the intake at 1 atm and the temperature of the water at the discharge is 10.2 C.
How to design a simply supported rectangular concrete beam havingcross section of 20 mm by 40 mm and a length of 3 meters that couldcarry a uniform load of 1000 KN.
A telephone wire 5 mm in diameter is suspended between telephone poles spaced 50 m apart. If the wind velocity is 100 km/h and the air is at 2 degrees C, 1 atm, determine the horizontal force (in N) the wire exerts on the poles.
If an analysis is made of the hydraulic conductivity of a site using permeameter tests of core samples, slug tests of monitoring wells, and pumping tests of production wells, it is often observed that the hydraulic conductivity as measured by each me..
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