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    				| 1. | Water enters through end A with a speed 0, and leaves through end B with a speed u2 of a cylindrical tube AB. The tube is always completely filled with water. In case I the tube is horizontal, in case II it is vertical with the end A upward and in case III it is vertical with the end B upward. We have v1 = v2 for(a) case I(b) case II(c) case III (d) each case. | 
| Answer» (d) each case. EXPLANATION: Since the water is incompressible, the volume of water entering end A and leaving through end B per unit time will remain constant in each case. Since the area of the cross-section of the cylindrical tube will be constant, v₁ = v₂ for each case. | |