Pardon the risqué nature of the following problem. During urination, a man releases about 380 mL of urine in about 38 seconds through the urethra, which we can model as a tube 4.1 mm in diameter and 23 cm long. Assume that the man's urine has a density of 1002 kg/m³ and has negligible viscosity. Suppose the bladder is 0.90 cm above the height where the urine is released. Suppose further that the urine in the bladder is approximately at rest. What is the flow speed of the urine as it leaves the urethra? (b) (13) What is the gauge pressure in the bladder such that the urine leaves the urethra at the speed found in part (a)?

Fig: 1

Fig: 2

Fig: 3

Fig: 4