4.62 Air enters an elbow with a uniform speed of 10 m/s as shown in Fig. P4.62. At the exit of the elbow, the velocity profile is not uniform. In fact, there is a region of separation or reverse flow. The fixed control volume ABCD coincides with the system at time 10. Make a sketch to indicate (a) the system at time t 0.01 s and (b) the fluid that has entered and exited the control volume in that time period.

As we learned, Bernoulli's equation is not to be used in many situations. Let's say you are examining changes between two points in a flow. Which ONE of these scenarios could you appropriately use Bernoulli's equation on? O A turbine is situated between the two points There are large changes in kinetic energy between the two points The mass flow rate between the two points changes with time There are large changes in density between the two points There are large viscous losses between the two points QUESTION 10 A 12 cm diameter jet of air strikes a plate positioned normal to the flow, with all air deflected away parallel to the plate. If the air flows at a speed of 20 m/s, what is the force needed to held the plate in place? Do not use a linear momentum correction factor. O 0.272 N 10.9 N 4510 N 5.45 N 0.340 N