One kg of liquid water at 25oc:

a). absorbs heat of 1000 calories. what is δut , in kj?
b). experiences a change in elevation δz. the change in potential energy δep is the same as δut for part a). what is δz, in meter?
c). is accelerated from rest to final velocity u. the change in kinetic energy δek is the same as δut for part a). what is u, in m/s?

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]