问题
单项选择题
如图所示，已知水在圆管中流动的流速分布公式为：u=2（1-r2/R2），R=0.05m，水的动力黏滞系数μ=1.14×10-3Pa·s，气管壁处的切应力τ=（）。
A．0.0912Pa
B．0.912Pa
C．9.12Pa
D．0.0456Pa
答案
参考答案：A
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如图所示，已知水在圆管中流动的流速分布公式为：u=2（1-r2/R2），R=0.05m，水的动力黏滞系数μ=1.14×10-3Pa·s，气管壁处的切应力τ=（）。
A．0.0912Pa
B．0.912Pa
C．9.12Pa
D．0.0456Pa
参考答案：A
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