Aprocess fluid having a specific heat of 3500 j/kg∙k and flowing at 2 kg/s is to be cooled from 80 °c to 50 °c with chilled water, which is supplied at a temperature of 15 °c and a flow rate of 2.5 kg/s. assuming an overall heat transfer coefficient of 2000 w/m2 ∙k, calculate the required heat transfer areas for the following exchanger configurations:

An observer that stands still as the electron moves by him, will observe

The heater element of a 120 v toaster is a 5.4 m length of nichrome wire, whose diameter is 0.48 mm. the resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 ω·m. the toaster is operated at a voltage of 120 v. (a) what is the power drawn by the toaster? (b) if the cost of electricity is 12 ¢ per kilowatt-hour, and it takes 2 minutes to toast bread, how much does it cost for toasted bread? (c) when the heater element is at room temperature, is the resistivity in the nichrome wire greater than, less than, or equal to it’s resistivity when at operating temperature? explain.

What is the role of the water cycle in maintaining freshwater levels in lake and rivers?