In a falling-ball visco met er, a s t ee l ball 1.1 mm in d iam

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Question:

In a falling-ball viscometer, a steel ball 1.1 mm in diameter is allowed to fall freely in a heavy fuel oil having a specific gravity of 0.88. Steel weighs 104 kN/m³ If the ball is observed to fall 257.1 mm in 6.0 s, calculate the viscosity of the oil.