Question

Which is not a dimensionless quantity is :

• A. Moment of Momentum
• B. Moment of force
• C. Moment of inertia
• D. All of the above

Answer 1

Answer: (D)

All of the above

Moment of Momentum $=mvr$

Dimension: $=M^1{L}^2{T}^{-1}$

Moment of force $=r\times f$

Dimension: $=M^1{L}^2{T}^{-2}$

Moment of Inertia $=M{r}^2$

Dimension: $=M^1{L}^2$

Hence, none of the quantity is dimensionless.