0.4 Methanol is contained in a large tank under a pressure of 3.1 bar absolute. When a valve on the bottom of the tank is opened the methanol drains freely though a I-cm ID tube whose outlet is 7.00 m below the surface of the methanol. The pressure at the outlet of the discharge pipe is 1 atm. (a) Use the Bernoulli equation to estimate the methanol discharge velocity and flow rate in L/min when the discharge valve is fully opened. Neglect the rate of fall of the methanol level in the tank. (See Example 7.1-2.) (b) When the discharge valve is partially closed, the flow rate decreases which means that Au 2 changes. However, the other two terms in the Bernoulli equation (AP p and g 4:) remain the same. How do you account for this apparently contradictory result? (Hint: Examine the assump- tions made in the derivation of the Bernoulli equation) 3.5 bar CH, OH 7 m