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The following function is used to determine a parachute’s falling velocity. Consider the function to determine its root, the drag coefficient, c such that the velocity, v is 40 m/s after a free-falling time (t) of 10 second. f(c)=(gm/c)(1-e^(-(c/m)t))-v g = gravitational acceleration = 9.81 m/s2 m = mass = 68.1 kg
An activated sludge system treats 1500 m3/day of raw wastewater with a BOD of 250 mg/L. The reactor volume is 375 m3. The kinetic parameters were determined to be: x = 3 day-1, Y = 0.55 kg SS/kg cells, and Ks = 150 mg/L.
Vehicles arrive at the booth at a rate of 4 vehicles per minute. The attendent opens the booth and improves the service rate over time following the function u(t)= 1.1 +0.3t, where u(t) is in vehicles per minute and t is in minutes.
Conduct either a qualitative or quantitative risk assessment on this project. Identify the risk factors that you consider most important for the suspension bridge construction. How would you assess the riskiness of the project? Why?
If the coefficient of sratic friction between the wheels at B and the ground is 0.5 determine if it is possible to pull at p=1200 lb without causing the wheels at B to slip or the front wheels of A to lift off the ground
1. an analysis of dredged sediments from a stormwater retention basin revealed a high concentration in mgkg of the
to achive a specific level of disinfection a water treatment plant operator determines the" Ct" value 180mg min/l is necessary with units for disinfectant concentration C in mg/l and disinfectant contact time t in minutes
A piston-cylinder device initially contains 1.4 kg saturatedliquid water at 200 C. Now heat is transferred to the wateruntil the volume quadruples, and the cylinder contains saturatedvapor only
If OA has a constant counterclockwise angular velocity of 10rad/s, calculate the angular acceleration of link AB and link BC for the position where the cordinates of A are x=-60mm and y = 80mm.
A concrete mix with a 3in slump, w/c ratio of .5, and sand with a fineness modulus of 2.4 contains 1700lb/yd3 of coarse aggregate. Compute the required weight of coarse aggregate per cubic yard
A concrete (n=0.013) stormwater channel, 6-feet in diameter, has a bed slope of 0.01%. What is the uniform flow in cfs when the pipe is half full
Three reservoirs are connected by three pipes with hA = 100 f t, hB = 20 f t, hC = 0 f t, L1 = 1000 f t, L2 = 500 f t, L3 = 400 f t and D1 = D2 = D3 = 1 f t. Determine flow rate into or out of each reservoir if friction in each pipe is 0.02.
According to his will: First give one coin to manager. 1/5th of the remaining to the elder son. Now give one coin to the manager and 1/5th of the remaining to second son and so on.
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