When designing a crankshaft, you want to be 99.9% certain that the fatigue limit of the material is in excess of the cyclic stresses it will realize in service. If the experimental fatigue limit for the material is 40 ksi, the actual limit must be at least...

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]