Water enters a 5-ft-wide, 1-ft-deep channel as shown in Fig. P4.39. Across the inlet the...

Water enters a 5-ft-wide, 1-ft-deep channel as shown in Fig. P4.39. Across the inlet the water velocity is 6 ft/s in the center portion of the channel and 1 ft/s in the remainder of it. Farther downstream the water flows at a uniform 2-ft/s velocity across the entire channel. The fixed control volume ABCD coincides with the system at time t = 0. Make a sketch to indicate (a) the system at time t = 0.5 s and (b) the fluid that has entered and exited the control volume in that time period.