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A factory discharges its waste into a river upstream from a lake. The discharge release rate is 2 kg formaldehyde per day. The decay is a first order process with a decay rate of 0.000005/s. The waste is discharge into the river 30 km upstream from the lake through an effective diffuser. The river flow velocity is 6 km/d. The volumetric flow rate for the river is 106 m3/d. the lake has dimensions of 4,000 m long by 600 m wide by 8 m deep. (Total Volume is 1.92 x 107 m3). There is an outlet stream from the lake with a flow rate of 106 m3/d.
Estimate the formaldehyde concentration in the lake using the plug flow model for the river and the completely mixed model for the lake.
A cable is made of two strands of different materials, A and B, and cross sections as follows: For material A, K = 60, 000 psi, n = 0.6, Ao = 0.6 in2 For material B, K = 30, 000 psi, n = 0.5, Ao = 0.3 in2
Find the minimum length of runway required for the landing (I found to be 300ft). Find the position on the runway where the speed is 50ft/s and the time it takes for the speed to reach 50ft/s
An adiabatic argon unit compresses argon at 200 kPa and 27C to 2.18 MPa. If the Argon leaves this compressor at 513C. What is the isentropic efficiency of the compressor
its desired to produce 5 cubic yards of cencrete with a ratio of 1:1.8:3.5 of cement, snd, and gravel what are the required amounts of components if 5.5 gallons of water per sack of cement is to be used
The solid circular disk of uniform thickness is released from rest on the 60-degree incline. Calculate the angular velocity w of the cylinder and the magnitude v of the velocity of its center C after it has moved 10 ft down the incline.
Determine the height, h, the water level will rise in the tank before remaining constant. Also, if initially the tank is empty, what amount of time will it take for the water level to rise to h? Be sure to justify all assumptions made.
Determine the minimum horizontal force P required to hold the crate from sliding down the plane. The crate has a mass of 70kg and the coefficient of static friction between the crate and the plane is μs = 0.45.
If the normal stress is 2,500 psi, Poisson's ratio is 0.25 and Young's modulus is 10,000 ksi, calculate the normal strain.
The back tangent gradient is -4 percent, the forward tangent gradient is 2 percent, and the elevation of the curve at station 48+50 must equal to at least 510ft. What is the required length of the curve?
Given Specific Gravity for Soil A is 2.00 and Specific Gravity for Soil B is 4.00, under what condition (Volume of Soil A and Soil B) will both the soil have the same weight
A 55 KG bungee jumper leaps from a bridge. She is tied to a bungee cord that is 12 m long when unstretched, and falls a total of 31 m. Calculate the spring constant of the bungee cord assuming Hooke's law applies.
Determine the velocity and acceleration of block B and determine the velocity and acceleration of Car A relative to Car B.
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