Two pressure gauges—E. Fig. P2.11 shows two pressure gauges that are mounted on a vertical water pipe 40 ft apart, yet they read exactly the same pressure, 100 psig. (a) Is the water flowing? Why? (b)...

Two pressure gauges—E. Fig. P2.11 shows two pressure gauges that are mounted on a vertical water pipe 40 ft apart, yet they read exactly the same pressure, 100 psig. (a) Is the water flowing? Why? (b) If so, in which direction is it flowing? Why? Hint: You may wish to use an overall energy balance in the pipe between the two gauges to check your answer.