A: 82 m/s
B: 98 m/s
C: 313 m/s
D: 343 m/s
举一反三
- A compressible fluid is flowing through a pipe with a constriction. The diameter of the narrow section is 1/2 the diameter of the wide section. The density of the fluid in the narrow section is 3/4 the density of the fluid in the wide section. If the velocity of the compressible fluid is 3.600 m/s in the narrow section, then what is the velocity of the fluid in the wide section? A: 0.675 m/s B: 0.805 m/s C: 0.250 m/s D: 0.333 m/s E: 0.500 m/s
- A rock is thrown straight up with an initial velocity of 15.0 m/s. Ignore energy lost to air friction. How high will the rock rise? A: 1.53 m B: 22.9 m C: 6.50 m D: 11.5 m
- 雷诺数取决于下列哪些因素( ) A: 特征尺寸Lc(characteristic length, m) B: 流体密度(fluid density, kg/m3) C: 特征速度V(velocity of the bulk fluid, m/s) D: 流体的动力粘度μ(dynamic viscosity, kg/m·s)
- A rock is thrown straight up with an initial velocity of 15.0 m/s. Ignore energy lost to air friction. How high will the rock rise? A: 1.53 m B: 22.9 m C: 6.50 m D: 11.5 m E: 13.5 m F: 15.7 m G: 21.5 m H: 17.5 m
- 管子中流体和气体的流速一般不超过（ ）。 A: 5 m/s，50 m/s B: 3 m/s，30 m/s C: 3 m/s，100 m/s D: 10 m/s，100 m/s
内容
- 0
Average velocity is defined by the equation v=s/t,____ v is the average velocity, s is the distance traveled, and t is the elapsed time.
- 1
雷诺数取决于下列哪些因素( ) 未知类型：{'options': ['特征尺寸Lc(characteristic length, m)', '流体密度(fluid density, [img=50x27]18033f6a26f2543.png[/img])', '特征速度V(velocity of the bulk fluid, m/s)', '流体的动力粘度μ(dynamic viscosity,kg/(m·s) )'], 'type': 102}
- 2
雷诺数取决于下列哪些因素( ) 未知类型：{'options': ['特征尺寸Lc(characteristic length, m)', '流体密度(fluid density, [img=50x27]18033f6a68c3abd.png[/img])', '特征速度V(velocity of the bulk fluid, m/s)', '流体的动力粘度μ(dynamic viscosity,kg/(m·s) )'], 'type': 102}
- 3
当一列火车以10 m/s的速率向东行驶时，若相对于地面竖直下落的雨滴在列车的窗子上形成的雨迹偏离竖直方向30°，则雨滴相对于地面的速率是__________；相对于列车的速率是__________ A: 17.3 m/s，20 m/s B: 20 m/s，17.3 m/s C: 11.54 m/s，5.77 m/s D: 11.54 m/s，20 m/s
- 4
空气中的声速大约是:( ) A: 300 m/s B: 1500 m/s C: 1570 m/s D: 5000 m/s E: 8000 m/s