5. A well-insulated, thin-walled, counter-flow heat exchanger is to be used to cool oil (cp = 2.20 kJ/kg. C) from 150 to 40-C at a rate of 2 kg/s by water (cp = 4.18 kJ/kg."C) that enters at 22°C and leaves at 40°C. Assuming a steady flow system, determine (a) the required mass flow rate (kg/s) of cooling water necessary to meat the desired cooling rate (b) heat transfer rate (kW). Hot oil 2 kyls | 150°C Cold water 40°C 22°C

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Free Body Diagram

The system of forces acting on a body tends to either rotate it or make the body undergo motion. In general, when an external agent exerts a force on a body, the body undergoes translational motion and rotational motion. The body has six degrees of freedom under the influence of that force. Here, three degrees of freedom are from the translational motion while the other three are from the rotation motion. However, sometimes the bodies are not allowed to undergo any motion and are fixed, under such conditions the body is said to be constrained.