知到答案工程流体力学智慧树答案_2022年

第八章

A 2-in. diameter shaft is supported by two sleeves, each of length = 2 in. The internal diameter of the sleeves is 2.1 in. The radial space between the shaft and the sleeves is filled with an oil of viscosity = 8 × 10-3 lb-s/ft2. If the shaft is rotated at a speed of 600 rpm, the viscous torque (ft-lb) on the shaft is most nearly （ ）。
答案:0.15
The force amplification can be realized by increasing the acting area. True or False? （ ） The pressure amplification can be realized by increasing the acting area. （ ）How to reduce hydraulic shock? （ ）。