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A thermoelectric cooler has a COP of 0.15 and removes heat from a refrigerated space at a rate of 180 W. Determine the required power input to the thermoelectric cooler, in W.
The hardness of 10,000 litres of hard water sample was completely removed by passing it through a zeolite softner. The zeolite softner required 5000 litres of NaCl solution containing 1170 mg of NaCl/litre. Determine the hardness of water?
Roller coasters are designed so that the riders will not experience more than a certain level of g-force during the ride. (The rider would experience B g's if hte normal force were Bmg where B is a numbe
a. The linear acceleration of the mass. b. The angular acceleration of the wheel. c. The tension in the rope.
Suppose that in a senior college class of 500 students it is found that 210 smoke, 258 drink alcoholic beverages, 216 eat between meals, 122 smoke and drink alcoholic beverages
For unidirectional carbon/epoxy tape at a 60% fiber volume fraction, calculate E11 and E22. Given Ef= 211 GPa and Em =10 GPa. Calculate the fiber weight fraction. Given pf=1.95 g/cm3 and pm =1.3 g/cm3.
The container is vented to the local atmosphere. What is the absolute pressure at the surface of the mercury and at the bottom of the container. Assume the conditions of the standards atmosphere prevail for pressure. Use sg = 13.54 for the mercury..
A long throated flume is built in a rectangular 1 m widechannel having a throat width of 0.5m. The upstream head is 0.6 m.Assume a Cd of 1.0.
Select the lightest available W14 section to support the axial compression dead load of PD= 140 k and a live load of PL = 120 k if the length is equal to 14 ft and A992 steel is used
A 10cm diameter vertical tank holds 20cm of water topped with 15cm of ethyl alcohol. The cylinder is rotated about its central axis at a rotation rate of 20 rad/s. (a) What will be the shape of the air-alcohol and alcohol-water interfaces (include ..
Discuss the differences between how engineers see themselves and how the public sees engineers
The temperature = 25°C; assume that u = 10^-2 after the addition. Compare the value obtained when ionic strength effects are taken into account with that calculated when it is neglected.
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
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