Chapter 11. Reynolds number (11-29)

Question

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{"title":"Reynolds number of a certain fluid flow","description":"Correct!","type":"correct","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"10,16,12,16\"},{\"shape\":\"rect\",\"coords\":\"3,44,68,92\"}]"} {"title":"Density of the fluid","description":"Wrong","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"118,11,119,13\"},{\"shape\":\"rect\",\"coords\":\"147,13,186,64\"}]"} {"title":"A length characteristic of the situation","description":"Incorrect","type":"incorrect","color":"#333300","code":"[{\"shape\":\"poly\",\"coords\":\"113,132\"},{\"shape\":\"rect\",\"coords\":\"195,33,199,34\"},{\"shape\":\"poly\",\"coords\":\"132,99\"},{\"shape\":\"rect\",\"coords\":\"185,6,201,57\"}]"} {"title":"Speed of the flow","description":"Incorrect","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"207,11,236,55\"}]"} {"title":"Viscosity of the fluid","description":"Incorrect","type":"incorrect","color":"#333333","code":"[{\"shape\":\"rect\",\"coords\":\"163,91,205,142\"}]"}

Question

tBsiNfUnwj/GaltJS6Frct4KgS6ns33w
{"title":"Reynolds number of a certain fluid flow","description":"Wrong","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"10,16,12,16\"},{\"shape\":\"rect\",\"coords\":\"3,44,68,92\"}]"} {"title":"Density of the fluid","description":"Correct!","type":"correct","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"118,11,119,13\"},{\"shape\":\"rect\",\"coords\":\"147,13,186,64\"}]"} {"title":"A length characteristic of the situation","description":"Incorrect","type":"incorrect","color":"#333300","code":"[{\"shape\":\"poly\",\"coords\":\"113,132\"},{\"shape\":\"rect\",\"coords\":\"195,33,199,34\"},{\"shape\":\"poly\",\"coords\":\"132,99\"},{\"shape\":\"rect\",\"coords\":\"185,6,201,57\"}]"} {"title":"Speed of the flow","description":"Incorrect","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"207,11,236,55\"}]"} {"title":"Viscosity of the fluid","description":"Incorrect","type":"incorrect","color":"#333333","code":"[{\"shape\":\"rect\",\"coords\":\"163,91,205,142\"}]"}

Question

wwHYbVBe2nbVFg19EJEDXdCC4VMUY68oY9qgc8Vyu25zLTEu4TWLF3qkvwU=
{"title":"Reynolds number of a certain fluid flow","description":"Wrong","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"10,16,12,16\"},{\"shape\":\"rect\",\"coords\":\"3,44,68,92\"}]"} {"title":"Density of the fluid","description":"Incorrect","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"118,11,119,13\"},{\"shape\":\"rect\",\"coords\":\"147,13,186,64\"}]"} {"title":"A length characteristic of the situation","description":"Correct!","type":"correct","color":"#333300","code":"[{\"shape\":\"poly\",\"coords\":\"113,132\"},{\"shape\":\"rect\",\"coords\":\"195,33,199,34\"},{\"shape\":\"poly\",\"coords\":\"132,99\"},{\"shape\":\"rect\",\"coords\":\"185,6,201,57\"}]"} {"title":"Speed of the flow","description":"Incorrect","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"207,11,236,55\"}]"} {"title":"Viscosity of the fluid","description":"Incorrect","type":"incorrect","color":"#333333","code":"[{\"shape\":\"rect\",\"coords\":\"163,91,205,142\"}]"}

Question

M+GIUnmSq36o9B7+E68Luwir6hkJJPpz
{"title":"Reynolds number of a certain fluid flow","description":"Wrong","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"10,16,12,16\"},{\"shape\":\"rect\",\"coords\":\"3,44,68,92\"}]"} {"title":"Density of the fluid","description":"Incorrect","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"118,11,119,13\"},{\"shape\":\"rect\",\"coords\":\"147,13,186,64\"}]"} {"title":"A length characteristic of the situation","description":"Wrong","type":"incorrect","color":"#333300","code":"[{\"shape\":\"poly\",\"coords\":\"113,132\"},{\"shape\":\"rect\",\"coords\":\"195,33,199,34\"},{\"shape\":\"poly\",\"coords\":\"132,99\"},{\"shape\":\"rect\",\"coords\":\"185,6,201,57\"}]"} {"title":"Speed of the flow","description":"Correct!","type":"correct","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"207,11,236,55\"}]"} {"title":"Viscosity of the fluid","description":"Incorrect","type":"incorrect","color":"#333333","code":"[{\"shape\":\"rect\",\"coords\":\"163,91,205,142\"}]"}

Question

Ki0EyvefEUoQ10/GAwW63As4dii6L7f0sZnztQ==
{"title":"Reynolds number of a certain fluid flow","description":"Wrong","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"10,16,12,16\"},{\"shape\":\"rect\",\"coords\":\"3,44,68,92\"}]"} {"title":"Density of the fluid","description":"Incorrect","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"118,11,119,13\"},{\"shape\":\"rect\",\"coords\":\"147,13,186,64\"}]"} {"title":"A length characteristic of the situation","description":"Wrong","type":"incorrect","color":"#333300","code":"[{\"shape\":\"poly\",\"coords\":\"113,132\"},{\"shape\":\"rect\",\"coords\":\"195,33,199,34\"},{\"shape\":\"poly\",\"coords\":\"132,99\"},{\"shape\":\"rect\",\"coords\":\"185,6,201,57\"}]"} {"title":"Speed of the flow","description":"Wrong","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"207,11,236,55\"}]"} {"title":"Viscosity of the fluid","description":"Correct!","type":"correct","color":"#333333","code":"[{\"shape\":\"rect\",\"coords\":\"163,91,205,142\"}]"}

Review

The experiment shown in Figure 11-34 is useful for measuring viscosity because the only forces making the fluid move are the frictional (viscous) forces that act between parts of the fluid and between the fluid and plates. In most real-life situations, however, there are also forces due to pressure differences acting on the fluid (for example, the pressure difference between the two ends of a garden hose as you water the lawn). To describe the relative importance of forces due to pressure difference and viscous forces in fluid flow, physicists use a dimensionless quantity—that is, a pure number with no units—called the \(\textbf{Reynolds number}\):