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A river traveling at a velocity of 10 km/day has a dissolved-oxygen content of 5 mg/L and an ultimate CBOD of 25 mg/L at distance x = 0 km. that is, immediately downstream of a waste discharge. The waste has a CBOD decay coefficient, k1 of 0.2 day-1. The stream has a reaeration rate coef-ficient, k2 of 0.4 day-1. and a saturation di:mind-oxygen concentration of 9 mg/L.
(a) What is the initial dissolved-oxygen deficit?
(b) What is the location of the critical point, in time and distance?
(c) What is the dissolved-oxygen deficit at the critical point?
(d) What is the dissolved-oxygen con-centration at the critical point?
Determine the highest temperature that air can be heated by heat addition while the mass flow rate remains constant.
The path of motion of a 7-lb particle in the horizontal plane is described in terms of polar coordinates as r= (3t+2) and theta=(0.2t^2-t) , where t is in seconds. Determine the magnitude of the unbalanced force acting on the particle when t=3s.
Water at 20 Degree C is pumped at a constant rate of 9m^3/h from a large resevoir resting on the floor to the open top of a anexperimental absorption tower.
determine the required diameter of the bar according to the maximum-distortion-energy theory. Use a factor of safety of 2 with respect to yielding.
A hot-rolled 7-mm-diameter steel rod is axially loaded at room Temp under a fully reversed cyclic loading. under the rotating beam test, the endurance limit for this steel is 470 MPA, under static loading the ultimate strenght is 1200 MPA.
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 a.) the height of the step in the channel botom if the width remains constant.
Soil has been compacted in an embankment at a bulk density of 2.15 Mg/m^3 and a water content of 12%. The value of Gs is 2.65. Calculate the dry density, void ratio, degree of saturation and air content.
The road is in good condition and is initially dry, but it becomes wet 160 ft before the stalled car (and stays wet until the car is reached). What is the minimum distance from the stalled car at which the driver could apply the brakes and still s..
A beam of length 3m with a non-uniform load of zero at end Aand 200N/m at end B i.e a vertical loading of 1/2 *200*3N with abending moment about A of 1/2*200*3*(2/3*3). The beam is supportedat end A for a distance of 0.5 m and a uniform suport force ..
Compute the volume flow rate required to produce a Reynolds number of 3.60 x 10 ^4. then, if the pipe is clean steel, compute several points of the velocity profile and plot the data.
the block w shown in figure below has a mass of 250 kg. bar ab rests against a smooth verticalnbspwall at end b and is
Consider the pressure-driven flow between stationary parallel plates separated by distance 2b. Coordinate y is measured from the channel centerline. The velocity field is given by u=u max(1-(y/b)^2).
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