What is the change in entropy of the lead when 2.0 kg of molten lead at its melting point temperature solidifies? For lead: LV = 207 kcal/kg at 1744°C, LF = 5.9 kcal/kg at 328°C
What will be an ideal response?
-0.020 kcal/K
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Determine the mass flow rate of R-134a required for steady state of the cross-flow heat exchanger shown. Air at 30ºC enters at a rate of 3.6 kg/s and leaves at 10ºC. The refrigerant enters at -10ºC, leaves at 5ºC, and has a specific heat of 2.1 kJ/kg?K.
Complete the spectral emissivity graph shown.
After working hard outside on a hot summer day, placing a towel soaked in cold water on your head can feel very good. The reason the towel feels cold to you is that
A. low temperature heat from the towel conducts to your head, lowering your temperature. B. cold air from the towel convects to your head. C. cold air radiates from the towel to your head. D. heat conducts from your head to the towel, lowering your temperature.
One ampere × one second is a unit of
a. power. b. current. c. voltage. d. electric charge. e. resistance.