To calculate the dimension of angular momentum, we can use its formula. One common formula for angular momentum ($L$) is $L = mvr$, where $m$ is mass, $v$ is velocity, and $r$ is the radius or distance. Step 1: Identify the formula for angular momentum. We will use the formula: $L = mvr$. Step 2: Determine the dimensions of each variable. • Mass ($m$) has dimensions of $[M]$. • Velocity ($v$) has dimensions of $[L][T]^{-1}$. • Radius ($r$) has dimensions of $[L]$. Step 3: Substitute the dimensions into the formula. $$ [L] = [M] \times [L][T]^{-1} \times [L] $$ Step 4: Simplify the expression. $$ [L] = [M][L]^{1+1}[T]^{-1} $$ $$ [L] = [M][L]^2[T]^{-1} $$ The dimension of angular momentum is $\boxed{[M][L]^2[T]^{-1}}$. That's 2 down. 3 left today — send the next one.