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jldavid
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Homework Statement
A 1.5-mm-diameter steel ball bearing (7830 kg/m^3) is dropped into a tank of SAE 30 oil. What is its terminal velocity?
The density of oil is 917kg/m^3, and the viscosity of oil is 0.26kg/(m*s).
Help is much appreciated!
Homework Equations
Force of drag = 1/2 * (density of fluid) * (area of sphere) * v^2 * (coefficient of drag)
Force of drag = 3 * pi * (coefficient of fluid) * (diameter of obj) * v
Coefficient of drag = 24 / (Reynolds number)
Reynolds number = (density of fluid * velocity of fluid * chracteristic length)/(viscosity of fluid)
The Attempt at a Solution
When I combine all the equations, the v's cancel out. Is there a different equation I should be using?