Chapter 11. Definition of viscosity (11-28)

Question

wAI1y8MvUgKaUqdSmW0C6k9li2krIUb+31OWMxZXaFhnqc/STDMHV1ZNkH+/pbnsjSD2jVzjJLElCRGJ
{"title":"Force required to pull the upper plate in Figure 11-34","description":"Correct!","type":"correct","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"10,16,12,16\"},{\"shape\":\"rect\",\"coords\":\"2,45,36,93\"}]"} {"title":"Viscosity of the fluid","description":"Wrong","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"118,11,119,13\"},{\"shape\":\"rect\",\"coords\":\"98,11,134,66\"}]"} {"title":"Area of either plate in Figure 11-34","description":"Incorrect","type":"incorrect","color":"#ff0000","code":"[{\"shape\":\"poly\",\"coords\":\"113,132\"},{\"shape\":\"rect\",\"coords\":\"195,33,199,34\"},{\"shape\":\"poly\",\"coords\":\"132,99\"},{\"shape\":\"rect\",\"coords\":\"133,7,169,55\"}]"} {"title":"Speed of one plate relative to the other","description":"Incorrect","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"179,15,211,55\"}]"} {"title":"Spacing between the plates","description":"Incorrect","type":"incorrect","color":"#00ff00","code":"[{\"shape\":\"rect\",\"coords\":\"120,81,171,138\"}]"}

Question

Ki0EyvefEUoQ10/GAwW63As4dii6L7f0sZnztQ==
{"title":"Force required to pull the upper plate in Figure 11-34","description":"Wrong","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"10,16,12,16\"},{\"shape\":\"rect\",\"coords\":\"2,45,36,93\"}]"} {"title":"Viscosity of the fluid","description":"Correct!","type":"correct","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"118,11,119,13\"},{\"shape\":\"rect\",\"coords\":\"98,11,134,66\"}]"} {"title":"Area of either plate in Figure 11-34","description":"Incorrect","type":"incorrect","color":"#ff0000","code":"[{\"shape\":\"poly\",\"coords\":\"113,132\"},{\"shape\":\"rect\",\"coords\":\"195,33,199,34\"},{\"shape\":\"poly\",\"coords\":\"132,99\"},{\"shape\":\"rect\",\"coords\":\"133,7,169,55\"}]"} {"title":"Speed of one plate relative to the other","description":"Incorrect","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"179,15,211,55\"}]"} {"title":"Spacing between the plates","description":"Incorrect","type":"incorrect","color":"#00ff00","code":"[{\"shape\":\"rect\",\"coords\":\"120,81,171,138\"}]"}

Question

W6YI6BujzGfCDpkdmvniI/H3qjO6jDnWhfHoY3OTKXA8zZF5kW31qA==
{"title":"Force required to pull the upper plate in Figure 11-34","description":"Wrong","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"10,16,12,16\"},{\"shape\":\"rect\",\"coords\":\"2,45,36,93\"}]"} {"title":"Viscosity of the fluid","description":"Incorrect","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"118,11,119,13\"},{\"shape\":\"rect\",\"coords\":\"98,11,134,66\"}]"} {"title":"Area of either plate in Figure 11-34","description":"Correct!","type":"correct","color":"#ff0000","code":"[{\"shape\":\"poly\",\"coords\":\"113,132\"},{\"shape\":\"rect\",\"coords\":\"195,33,199,34\"},{\"shape\":\"poly\",\"coords\":\"132,99\"},{\"shape\":\"rect\",\"coords\":\"133,7,169,55\"}]"} {"title":"Speed of one plate relative to the other","description":"Incorrect","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"179,15,211,55\"}]"} {"title":"Spacing between the plates","description":"Incorrect","type":"incorrect","color":"#00ff00","code":"[{\"shape\":\"rect\",\"coords\":\"120,81,171,138\"}]"}

Question

03KY8RNeKcJeM6zxUY8EaNFSl+WdDamWsDmqd2QAeB4QOtHYPfHO37mbCfg=
{"title":"Force required to pull the upper plate in Figure 11-34","description":"Wrong","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"10,16,12,16\"},{\"shape\":\"rect\",\"coords\":\"2,45,36,93\"}]"} {"title":"Viscosity of the fluid","description":"Incorrect","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"118,11,119,13\"},{\"shape\":\"rect\",\"coords\":\"98,11,134,66\"}]"} {"title":"Area of either plate in Figure 11-34","description":"Incorrect","type":"incorrect","color":"#ff0000","code":"[{\"shape\":\"poly\",\"coords\":\"113,132\"},{\"shape\":\"rect\",\"coords\":\"195,33,199,34\"},{\"shape\":\"poly\",\"coords\":\"132,99\"},{\"shape\":\"rect\",\"coords\":\"133,7,169,55\"}]"} {"title":"Speed of one plate relative to the other","description":"Correct!","type":"correct","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"179,15,211,55\"}]"} {"title":"Spacing between the plates","description":"Incorrect","type":"incorrect","color":"#00ff00","code":"[{\"shape\":\"rect\",\"coords\":\"120,81,171,138\"}]"}

Question

eMkeunnH3LRKvYTWHZw6EVcDorcmueG3Rw8Z4p2JKBQ=
{"title":"Force required to pull the upper plate in Figure 11-34","description":"Wrong","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"10,16,12,16\"},{\"shape\":\"rect\",\"coords\":\"2,45,36,93\"}]"} {"title":"Viscosity of the fluid","description":"Incorrect","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"118,11,119,13\"},{\"shape\":\"rect\",\"coords\":\"98,11,134,66\"}]"} {"title":"Area of either plate in Figure 11-34","description":"Incorrect","type":"incorrect","color":"#ff0000","code":"[{\"shape\":\"poly\",\"coords\":\"113,132\"},{\"shape\":\"rect\",\"coords\":\"195,33,199,34\"},{\"shape\":\"poly\",\"coords\":\"132,99\"},{\"shape\":\"rect\",\"coords\":\"133,7,169,55\"}]"} {"title":"Speed of one plate relative to the other","description":"Wrong","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"179,15,211,55\"}]"} {"title":"Spacing between the plates","description":"Correct!","type":"correct","color":"#00ff00","code":"[{\"shape\":\"rect\",\"coords\":\"120,81,171,138\"}]"}

Review

Equation 11-28 says that the greater the viscosity \(\eta\), the greater the force that must be applied to move one plate relative to the other. The units of viscosity are pascals times seconds, or Pa \(\cdot\) s for short. Viscosities are also sometimes given in poise, named for the nineteenth-century French scientist Jean Poiseuille; 1 poise equals 0.1 Pa \(\cdot\) s.