Question

with a flowrate of 10. kg/s. Energy-related values for streams are given bel p. Specific InternalEnerg Specifi-Enthal ykl kgー specific-oumc,ーーーーーーーーー -kl kg 1.00 ー Entering Leaving 0.00101 210 2600 211 20.0 0.501 2800 The amount of heat needed is closest to which value (show your work): 2600 kJ/s 28000 kJ/s 23900 kJ/s 25890 kJ/s q. An object is being cooled from an initial temperature of 300°C by contact with a fluid at 100°C. The rate of change in temperature for the object is given by this equation: dT 1(100-T) dt 4 where the constant 4.0 has units of minutes, T and 100 have units of degrees Celcius. Use numerical integration to fill in the table to find the temperature vs time for several time steps Time, min 0.0 0.2 0.4 dT/dt 300 r. Let ta be the time it takes for the object to cool from 300 to 290 degrees and ts is the time it takes for the object to cool from 150 to 140 degrees. How would the times compare? explain briefly:

Answer 1

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