An insulated rigid tank contains 1.5 kg of helium at 30oC and 500 kPa. A paddle wheel

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An insulated rigid tank contains 1.5 kg of helium at 30oC and 500 kPa. A paddle wheel with a power rating of 0.1 kW is operated within the tank for 30 minutes. Determine
(a) The minimum work in which this process could be accomplished and
(b) the energy destroyed (I) in the universe during the process. Assume the surroundings to be at 100 kPa and 25oC.
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