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Assuming that the specific gravity of the following substances is approximately the same, that is, 2.65, and that the water is at 20°C, calculate the time it will take to settle 1m of the following materials: a) Gravel (Dp=10,000 μm) in seconds I want help with this one, I did the problem but the time gave me 36.36 seconds and the Dr told me that the result is incorrect, I would like to know how to do it. I used the formula of V=Dp^2(g)(△p) / 18μ ; Then use a substitution to calculate the time which would be t=h/v

Assuming that the specific gravity of the following substances is approximately the same, that is, 2.65, and that the water is at 20°C, calculate the time it will take to settle 1m of the following materials: a) Gravel (Dp=10,000 μm) in seconds I want help with this one, I did the problem but the time gave me 36.36 seconds and the Dr told me that the result is incorrect, I would like to know how to do it. I used the formula of V=Dp^2(g)(△p) / 18μ ; Then use a substitution to calculate the time which would be t=h/v

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Assuming that the specific gravity of the following substances is approximately the same, that is, 2.65, and that the water is at 20°C, calculate the time it will take to settle 1m of the following materials:

a) Gravel (Dp=10,000 μm) in seconds

I want help with this one, I did the problem but the time gave me 36.36 seconds and the Dr told me that the result is incorrect, I would like to know how to do it. 
I used the formula of V=Dp^2(g)(△p) / 18μ ; Then use a substitution to calculate the time which would be t=h/v

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