Question

The dimensions of viscosity coefficient are:

• A. $M{L}^{-1}{T}^{-1}$
• B. $ML{T}^{-1}$
• C. $M{L}^{-1}T$
• D. $MLT$
• E. $ML{T}^{-2}$

Answer 1

Answer: (A)

From Newtons formula: $\eta =\frac{F}{A(\Delta v_x/\Delta z)}$ Dimensions of $\eta =\frac{[ML{T}^{-2}]}{[L^2][L{T}^{-1}/L]}=\frac{[ML{T}^{-2}]}{[L^2][T^{-1}]}$ $=M{L}^{-1}{T}^{-1}$