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The Biosolids from a wastewater treatment process contains 1 mg cadmium per Kg of dry solids. The biosolids from the plant contain 23% solids and have a specific gravity of 1.01. If the state department of environmental quality has determined that no more than 0.8 Kg of cadmium can be applied to an agricultural land per acre per year, how many liters of biosolids can be applied to an acre of land in a year?
An insurance sales representative sells policies to 5 men, all of identical age and in good health. According to the actuarial tables, the probability that a man of this particular age will be alive 30 years hence is 2/3.
Given the following information, determine the required DO concentration in the treatment plant effluent discharge in order to ensure that at no point downstream the DO in the river drops below 4 mg/L
A floor slab has a fundamental bending frequency of 10Hz. A shaker is placed at the centre of the slab for a dynamic testing. The tests confirm that the slab displays a damping ratio of 2% of critical.
She plans to deposite 5% of her yearly salery, into retirment fund that earns 7% intrest compounded daily. what amount will accumulate at time of her retirement?
A rectangular channel is to carry 200 cfs. The mean velocity must be greater than 2.5 fps. The channel bottom width should be about twice the channel depth. Find the channel cross section and the required channel slope.
At the beginning of compression the pressure is 14 psi and the temperature if 60°F. The temperature at the end of combustion heat addition is 1500°F and the compression ratio is 9. Use constant specific heats at room temperature
Refrigerant 134a enters the condenser of a residential heat pump at 800 kPa and 35 degrees celcius at a rate of 0.018 kg/s and leaves at 800 kPa as a saturated liquid.
A first order reaction is employed in a destruction kind of a certain kind of microorganism. ozone is used as the disinfectant and the reaction is found to be dC/dt=-kC. where C is the concentration of microorganisms, microbes/ml.
a 20 kg block slides along the rough surface for which the coefficient of kinetic friction is 0.2. The block strikes a nonlinear spring with a speed of v=4.5 m/s. The spring is termed "nonlinear" because it has resistance of Fs=ks^2
Estimate the amount of Ca(OH)2(s) leached from concrete during a one-year period by precipitation. Assume that the area receives 40 in/yr of precipitation which is in equilibrium with
A 24-in.-long copper bar with a yield strength of 30,000 psi is heated to 120°C and immediately fastened securely to a rigid framework. The coefficient of thermal expansion for copper is 16.6x10-6 (1/oC).
The entrance to the pipe is reentrant, with ke = 0.9, and the nozzle loss coefficient is 0.045. Find the flow rate and the pressure head at the base of (entrance to) the nozzle.
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