# Homework Help: Calculating the viscosity of a 'test fluid' HELPPPPPPP

1. Jan 1, 2010

### bradley123

Calculating the viscosity of a 'test fluid' HELPPPPPPP!!

Can anyone please help me calculate the viscosity of each of the test fluids below. there are 5 of them and have each been tested 6 times. I am supposed to be doing straight line graphs and using the gradient to use to calculate the viscosity but I am having trouble big time :(

Speed ms-1 Force applied N

2 0.97 1.22 1.24 0.91 1.35 0.96
4 1.74 1.89 1.83 2.08 1.77 2.04
6 2.25 2.11 2.55 2.72 2.45 2.18
8 3.55 3.47 3.26 3.11 3.33 3.51
10 3.76 3.59 3.98 3.81 3.75 3.38

2. Jan 2, 2010

### thebigstar25

Re: Calculating the viscosity of a 'test fluid' HELPPPPPPP!!

what are these numbers suppose to mean .. please clarify ..

3. Jan 4, 2010

### rock.freak667

Re: Calculating the viscosity of a 'test fluid' HELPPPPPPP!!

Not sure how you did your experiment but I'd assume Stokes' Law F=6πμrv, plotting F against v will give a straight line with gradient 6πμr, where 'r' is the radius.

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