题目内容

Inapipe,flowrateis9L/minandflowvelocityis0.1m/s.Thecross-sectionareaofthepipeis:

A. 5cm2
B. 10cm2
C. 15cm2
D. 20cm2

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Inapipe,flowrateis30L/minandflowvelocityis0.3m/s.Thecross-sectionareaofthepipeis:

A. 10cm2
B. 15cm2
C. 16.7cm2
D. 20cm2

Mostoftheenergynotusedtomovetheloadinahydraulicsystemturnsinto().

A. light
B. potential
C. heat
D. noneoftheabove

Thepictureshowsapipewithdifferentsectionalarea.CompareflowvelocityvandflowrateQoffluidatdifferentsections.

A. v2>v3>v1;Q1=Q2=Q3
B. v1>v3>v2;Q1=Q2=Q3
C. v1=v2=v3;Q2>Q3>Q1
D. v1=v2=v3;Q1>Q3>Q2

Lowviscosityfluidsconsumemorepower.

A. 对
B. 错