Explanation The definition of the coefficient of viscosity is η = F d / A v and this expression is rearranged for F = η A v / d . Given info : The viscosity of glycerine is 1500 × 10 − 3 N ⋅ s/m 2 , thickness of glycerine is 1.5 mm , sides of the microscope slides are 1.0 cm and 4.0 cm , and the speed of the microscope slides is 0.30 m/s . The formula for the force required to pull the block with a constant speed is, F = η A v d η is viscosity of glycerine. A is area of the microscope slides. v is speed of the microscope slides. d is thickness of glycerine. Substitute 1500 × 10 − 3 N ⋅ s/m 2 for η , 1.0 cm × 4

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Chapter 9, Problem 64P

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The force required to pull the block with a constant speed.

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Chapter 9, Problem 63P

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The force required to pull the block with a constant speed.

Solution Summary: The author explains the force required to pull the block with a constant speed. The definition of the coefficient of viscosity is eta =Fd/Av

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Chapter 9 Solutions