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Using a well-insulated heat exchanger, groundwater with a temperature of 100 ° C and a flow rate of 1 kg / s (cp -4.20 kJ / kg ° C), a temperature of 30 ° C and a flow of 0.7 kg / s (cp = 4.19 kJ / kg ° C) will be heated to 70 ° C. Calculate (a) the amount of heat transfer and (b) the amount of entropy generation that occurs in the heat exchanger.
Two automobiles are equipped with the same single-frequency horn. When one is at rest and the other is moving toward the first at 13m/s, What is the frequency the horns emit
A point charge of 20nC is placed on the x-axis at the point x = 2. Find the x-component of the electric field Ex at x = 4 and x = -1 where the coordinates are in meters
consider a metal rod, length = .30m, cross sectional area=0.0010m^2, temperature difference between the ends is 65*C. What is the thermal conductivity of the metal
two trains a and b are approaching each other. the observer is in train a which is going west at 40 miles per hour.
A freight train has a mass of 1.8 x 107 kg. If the train can exert a constant pull of 7.8 x 105N, find how long does it take to increase the speed of the train
At the start of a trip, a driver adjusts the absolute pressure in her tires to be 2.51 x 105 Pa when the outdoor temperature is 277 K. find the air temperature in Kelvin inside the tires at the end of the trip
A silicon sample is doped with phosphorus at 1.17 parts per 1.00*10^6, Calculate the number of free (conduction) electrons per unit volume of the doped silicon in conduction electrons per cm^3
Classify and explain the five legal theories you could use in an attempt to have the regulation declared invalid and overturned in court.
A rocket is fired in deep space, where gravity is negligible. In the first second it ejects 1/160 of its mass as exhaust gas and has an acceleration of 15.3 m/s^2. find the speed (v_gas) of the exhaust gas relative to the rocket
The milk delivery was only that morning. They reported the problem to their supplier, BovoMania Dairy.
A charged paint is spread in a very thin uniform layer over the surface of a plastic sphere of diameter 14.0cm, Find the electric field just inside the paint layer
A uniform 163 kg, 6m beam is held at rest by a vertical post s=2 m from its right end, and a vertical cable attached to its right end. A 92 kg man stands at the left end of the beam, d= 4m from the post. create a complete FBD for the beam.
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