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Consider a highway section where traffic is stationary, all trucks travel at speed s and cars at speed v. If aerial surveillance revealed that trucks were a fraction p of the vehicles on a photograp
Water is used in a heat exchange to cool 5 kg/s of air from 400 C to 200 C. Calculate (a) the minimum mass flux (kg/s) of the water and (b) the quantity of heat transferred (MJ) to the water each se
A steady flow of refrigerant 134a enters a throttling valve in a refrigeration unit as a satrurated liquid with a pressure of 150 psia. The refrigerant is discharged with a pressure of 40 psia.
If a temperature inversion forms over the city at a height of 0.70 km, how long will it take the carbon monoxide concentration to reach 50 ppm if the wind velocity is zero If the wind velocity is 1
an air space above a long tube is pressurized to 50 kPa vacuum. water (20 degrees C) from a reservoir fills the tube to a height h. If the pressure in the air space is changed to 25kPa vacuum, will
Imagine two small towns of 1,000 people: Blacktop and Parktown. In the urban sprawl that is Blacktop, all the residents own fuel-efficient cars (15 km/liter) and travel an average of 20,000 km per y
Additional cost at the end of year 1 = $50,000. Benefit at the end of year 1 = $0. Annual benefits at the end of Years 2-10 = $20,000. Interest Rate = 7%. Conventionally B/C ratio and wheter the pro
determine the length of an interval of time such that the probability of at least one call in the interval is 0.90
A chemical plant produces a process wastewater that contains a relatively high concentration of a small number of nontoxic organic compounds, but very low concentrations of solids or salts. It has n
. In order to get full credit for this problem you must list all unknown species that would exist in the raindrop and all pertinent equations regardless of their level of significance. You must alge
150,000 mol of aqueous phosphoric acid (H3PO4) solution contains 5.00% H3PO4 by moles. The solution is concentrated by adding pure H3PO4 at a rate of 20.0 L/min.
Using Raoult's Law or Henry's Law, as appropriate, calculate the pressure and mole fractions in the vapor phase for a system containing a liquid that is 0.3% N2 and 99.7% water (by moles) in equilib
Suppose a sample of the 90 °C air is put in a closed variable-volume chamber containing a mirror, and the pressure is raised at constant temperature until a mist forms on the mirror. At what pre
Draw block diagrams of the unit operations necessary to treat the following wastes to effluent levels of BOD5 = 200 mg/L, SS = 100 mg/L, P = 5 mg / L (required for discharge into a sanitary sewer).
The Pomdeterra wastewater treatment plant produces thickened sludge that has a suspended solids concentration of 3.8%. They are investigating a filter press that will yield a solids concentration of
An electric power plant consumes 2.5 million gallons per day of cooling water. To control bacterial growth (slime), 2.0 mg/L of chlorine (measured as Cl2) is injected into the make-up water fed to t
The pressure inside the cylinder is 50 atm and temperature is 298o K. Provide your engineering judgement (with calculations) to justify or not justify the shipment of the cylinder.
You have a contaminated air stream containing 1000 ppmV of toluene and you decided to incinerate to a DRE of 99.9%. You are using butane as fuel to reach the temperature and consider the lean toluen
A closed system of 0.123kg undergoes a frictionless, quasi-static process along the path PV=C from 100kpa to a final state where the volume is twice the initial volume.
The temperature when the tires were in flated was 25 F. Assuming no change in air mass or volume, what is the temperature (F) in the tire after driving yesterday is a pressure on 44 psig was measure
The initial conditions of the helium are 7 ft^3, 80 psia, and 100 F. The helium expands reversibly according to process PV^1.5=C until the pressure reaches 15 pisa.
A cylinder fitted with a piston has a volume of 2ft^3 and contains 0.5 lbm of steam at 60 psia. Heat is tranferred to the stream until the temperatureis 500 F, while the pressure remains constant
A person with a mass of 200kg wearing snow skis is gliding down a long slope at an angle of 20 degrees. Each ski is 200cm long and 5 cm wide. The pressure of the skis on the snow melts a thin layer
a particle p moves along the spiral path r=(10/theta)ft, where theta is in radians. If it maintains a constant speed v=20 ft/sec, determine Vr and V Theta as functions of theta and evaluate each at
Determine the degree of saturation of a sample of soil given that its maximum dry unit weight is 18 kN/m^3 and its optimum moisture content is 12.1%. Assume the Specific Gravity of soil is 2.65.