The following data were obtained for a proprietary salad dressing tested at $22^{circ} mathrm{C}$ in a cup

Question:

The following data were obtained for a proprietary salad dressing tested at $22^{\circ} \mathrm{C}$ in a cup and bob viscometer (cup diameter $=4.2 \mathrm{~cm}$, bob diameter $=4.01 \mathrm{~cm}$, length of $6 \mathrm{~cm}$ ):

rpm	2	4	8	32	64	256
Torque $(\mathrm{N} \mathrm{m}) \times 10^{3}$	3.98	4.84	6.06	8.48	10.6	19.7

Calculate the shear stress, shear rate, and viscosity for this material, and fit a suitable viscosity model to this data set.

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