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A river with 400 ppm of salts (a conservative substance) and an upstream flow of 25 m^3/s receives an agricultural discharge of 5.0 m^3/s carrying 2000 mg/L of salts. The salts quickly become uniformly distributed in the river. A municipality just downstream withdraws water and mixes it with enough pure water (no salt) form another source to deliver water having no more than 500 ppm salts to its costumers. What should be the mixture ratio of pure water to river water?
Two infinite parallel horizontal surfaces are seprated by a film ofSAE 10W oil at T=10 C that is d=0.0144 in. thick . The uppersurface moves with speed V
determine the angular acceleration of the spool and the acceleration of the trailer. The wheels have negligible mass and are free to rotate.
If the bag is released with the same upward velocity of 6m/s when t=0 and hits the ground when t-8 seconds, determine the speed of the bag as it hit the ground and altitude of the balloon at this instant (t=8s).
calculate the density and specific weight of carbon dioxide at a pressure of 300 kN/m^2 absolute and 60º C
Consider a piston/cylinder arrangement that has a linear spring mounted such that as the piston rises to a certain point it will encounter the spring, which will offer a downward component of force as the piston rises further.
An in-ground swimming pool may have a leak. The 30-ft by 10-ft by 5-ft (depth) pool is filled on June 1. On June 13, a hose, flowing at a rate of 10 gallons per minute, is used to add water to the pool. The hose is turned off after 1 hour.
Draw an inverted bowl – i.e., a horizontal line (exactly 10 inches long), with a big semi-circular upside-down “U” connecting the ends of that horizontal line. This is a picture of the ground and sky. Draw a little tiny person (you) at the mid-point ..
Two activated sludge aeration tanks in Podunk, MO are operated in series. Each tank has the follwing dimensions: 7.0 m wide x 28.0 m long x 3.5 m effective liquid depth.
The United States Environmental Protection Agency (EPA) has published the following data for municipal solid waste generation (in millions of tons). Estimate a value of MSW generation in the year 2025.
A sample of neon has a volume of 555 mL when it is at a pressure of 813 mmHg. What will be the volume when the pressure is increased to 1138 mmHg?
A w14X74 of A992 Steel has a length of 20 feet and fixed ends. Compute the design compressive strength for LRFD and the allowable compressive strength for ASD.
During the recent camping trip, a curious junior engineering student (like yourself) noticed that water is being discharged from a high reservoir to a stream in the valley through a 0.3 m diameter plastic pipe.
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