# 2005_Exam3 - 057:20 TEST # 3 Fall 2005 1. A thin 20-cm...

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057: 20 TEST # 3 Fall 2005 1. A thin 20-cm ¯ 20-cm flat plate is pulled at 1 m/s horizontally through a 3.6- mm-thick oil layer sandwiched between two plates, one stationary and the other moving at a constant velocity of 0.3 m/s, as shown in the figure. The dynamic viscosity of oil is 0.027kg/m·s. Assuming the velocity in each oil layer to vary linearly, determine the force that needs to be applied on the plate to maintain this motion. 2. A 90° elbow is used to direct water flow at a rate of 25 kg/s in a horizontal pipe upward. The diameter of the entire elbow is 10cm. The elbow discharges water into the atmosphere, and thus the pressure at the exit is the local atmospheric pressure. The elevation difference between the centers of the exit and the inlet of the elbow is 35 cm. The weight of the elbow and the water in it is considered to be negligible. Take the momentum-flux correction factor to be 1.03. Determine (a) the gage pressure at the center of the inlet of the elbow and (b) the anchoring force needed to hold the elbow in place.

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## This note was uploaded on 12/08/2011 for the course MECHANICS 57:020 taught by Professor Fredrickstern during the Fall '10 term at University of Iowa.

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2005_Exam3 - 057:20 TEST # 3 Fall 2005 1. A thin 20-cm...

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