Engineering, 21.10.2020 16:01 raiderries
The electric power P (in W) produced by a certain battery is given by: P= 49r/ (r+0.8)^2, where r is the resistance in the circuit. For what value of r is the power a maximum?
Answers: 2
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Athin walled concentric tube exchanger is used to cool engine oil from 160°c to 60°c with water that is available at 25°c acting as a coolant. the oil and water flow rates are each at 2 kg/s, and the diameter of the inner tube is 0.5 m and the corresponding value of the overall heat transfer coefficient is 250 w/m2. oc. how long must the heat exchanger be to accomplish the desired cooling? cpwater=4.187 kj/kg-candcpengine el=2.035 kj/kg·°c, oil . 120]
Answers: 1
The electric power P (in W) produced by a certain battery is given by:
P= 49r/ (r+0.8)^2, where r i...
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