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Thermoelectric coolers that plug into the cigarette lighter of a car are commonly available. One such cooler is claimed to cool a 12-oz (0.771-lbm) drink from 78 to 38°F or to heat a cup of coffee from 75 to 130°F in about 15 min in a well-insulated cup holder. Assuming an average COP of 0.2 in the cooling mode, determine (a) the average rate of heat removal from the drink, (b) the average rate of heat supply to the coffee, and (c) the electric power drawn from the battery of the car, all in W.
calculate the depth of water in a stormwater pond resulting from a two hour rainfall event. the rainfall occurs over a 24-acre watershed at an average rate of 1 inch/hour. the runoff coefficient is 0.5.
Measurements of groundwater concentrations of silica (SiO2) in mg/L, were made at a sample of 12 wells in Birmingham. The sample mean concentration was 61.3 and the standard deviation was 5.2.
A coast guard helicopter hovers between an island and a damaged sailboat. How would you calculate the direct distance between the helicopter and the sailboat? From the island, the angle of elevation to the helicopter is 73 degrees.From the helicopter..
Show that the head loss in a hydraulic jump formed in a rectangular channel may be expressed as : change in E =(y2 - y1)^3/(4y1*y2) where y1 and y2 are depth of flow before and after jump.
Simplify the shape of the base and the 4 legs and estimate the minimum number of tugs needed to tow the structure at the required speed. The most powerful tugs can produce a thrust of approximately 2000kN,i.e.200tons.
A curve of radius 300 ft and e = 10% is located at the section of an existing rural highway, which restricts the safe speed at this section of the highway to 40% of the design speed.
An electric resistance heater now heats the water. Calculate the amount of heat added to the water and the associated change in entropy when the volume of the water is 50 times its initial value.
Calculate the BOD loading and days of winter storage available between the 0.6 and 1.5 m depths, assuming a daily water loss of 0.30 cm by evaporation and seepage.
A large drainage channel has a trapezoidal cross section with a bottom width of 75 feet and bank side slopes of 4:1 (H:V). If the normal depth of flow is 25 feet, compute the normal flow rate through the channel (Q in cfs).
One gram of pepper is placed into a 100 mL beaker, and the beaker is filled with water to the 100 mL mark. What is the concentration of pepper in mg/L? What should one assume in this problem? What is the density of pepper? What is the volume of 1 g o..
A 32mm rebar with a guage length of 200mm was subjected to tension to fracture according to ASTM E-8 method. The load and deformation data were as shown in table below.
The solid silver chloride is placed in water. It reaches equilibrium and has a solubility product constant of 1.8 x 10-10. What is the concentration of silver if the chloride concentration is raised to 3M
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