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An Engineer is considering the development of a small wind turbine (D=1.25m) for home applications. The design wind speed is 15 mph at T=10C and p=0.9 bar. The efficiency of the turbine is n=20% meaning that 20% of the kinetic energy in the wind can be extracted. estimate the power in watts that can be produced by the turbine.
Hint: In a time interval delta t, the amount of mass that flows through the rotor is delta m=m(dot)*delta t and the corresponding amount of kinetic energy is this flow is (delta m V^2/2).
An uncatalyzed reaction has a rate of 4.2 x 10-7 sec-1. When an enzyme is added the rate is 3.2 x 104 sec-1. Calculate the rate enhancement caused by the enzyme.
A tracer dye is injected into a 55-ft thick sandy gravel confined aquifer which has a hydraulic conductivity of 1.2 x 10^-3 ft/s. The dye appears 14 days later in an observation well 75 ft away from the injection point.
The maximum and minimum dry unit weights of a sand were determined in the laboratory to be 104 lb/ft^3 and 93 lb/ft^3, respectively. what would be the relative compaction in the field if the relative density is 78%
Calculate the length and diameter of the reaction zone of an afterburner that treats 2000 acfm of polluted air (measured at 250 F). The gases in the after burner are at a temperature of 1400 F for a residence time of 0.50 sec.
Two reservoirs are connected by a pipeline. The pipeline is 1 m in diameter and has a friction factor of 0.03. The elevation difference between the reservoirs is 30 m. The two reservoirs are 5 km apart. The sum of the minor loss coefficients is 34. C..
The rigid bar AD is supported by two steel wires of (1/16)" diameter (E=29x10^6 psi) and a pin and bracket at D. Knowing that the wires were initially taut, determine (a) the additional tension in each wire when a 120-lb load P is applied at B
We have a small wood deck, 8' by 8' This deckshould only have a max of five adults on it. Oneside of deck is attached to the wall of the house, and out fromthis wall is two post six feet from the wall. Problem is the load bearing strength of the be..
At an axial load of 23 kN, a 40-mm-wide by 10-mm-thick polyimide polymer bar elongates 2.7 mm while the bar width contracts 0.17 mm. The bar is 240 mm long. At the 23-kN load, the stress in the polymer bar is less than its proportional limit.
A groundwater is contaminated with methyl tertiary butyl ether (MTBE) at a concentration of 20 mg/L.the groundwater will be treated with an advanced oxidation process that involves formation of hdyroxyl free radical (OH*).
Investigators have determined that the rate equation for bacterial kill in batch chlorine contact chambers is: rxn rate = dC/dt=-kCt where C is the concentration of bacteria, k is the rate constant, and t is time.
Determine suitable footing dimensions to suit the bearing capacity of 100kPa with a factor of safety 2.4
At a given instant, the position of a plane at A and a train at B are measured relative to a radar antenna at O. Determine the distance d between A and B at this instant.
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