Engineering, 20.12.2019 02:31 haitiindianari
Awatermelon initially at 35": is to be cooled by dropping it into a lake at 15 =c. afterd h and 40 min of cooling, the centertemperature of watermelon is measured to be 20°c. treating the watermelon as a 20-cm-diameter sphere and using theproperties k= 0.618 w/m-k, a = 0.15 x 10—6 m2/s. p = 995 kg/m3. and cp: 4.18 kj/kg-k, determine the average heattransfer coefficient and the surface temperature of watermelon at the end of the cooling period.
Answers: 2
Engineering, 03.07.2019 14:10
Amass of 1.5 kg of air at 120 kpa and 24°c is contained in a gas-tight, frictionless piston-cylinder device. the air is now compressed to a final pressure of 720 kpa. during the process, heat is transferred from the air such that the temperature inside the cylinder remains constant. calculate the boundary work input during this process.
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Awatermelon initially at 35": is to be cooled by dropping it into a lake at 15 =c. afterd h and 40...
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